Multiple email notifications are being sent

Hi,

Several emails are being received by users for the same notification.

Here are the details of my website:

### wp-core ###

version: 5.3.2
site_language: en_US
user_language: en_US
timezone: America/Denver
permalink: /blog/%year%/%monthnum%/%day%/%postname%/
https_status: true
user_registration: false
default_comment_status: open
multisite: true
user_count: 4565
site_count: 2
network_count: 1
dotorg_communication: true

### wp-dropins (1) ###

db.php: true

### wp-active-theme ###

name: VW Fashion Designer Pro (vw-fashion-designer-pro)
version: 1.0
author: VW Themes
author_website: https://www.vwthemes.com/
parent_theme: none
theme_features: post-thumbnails, align-wide, automatic-feed-links, woocommerce, custom-header, title-tag, wc-product-gallery-zoom, wc-product-gallery-lightbox, wc-product-gallery-slider, custom-logo, menus, custom-background, editor-style, widgets
theme_path: /home/XXXXXXX/public_html/wp-content/themes/vw-fashion-designer-pro

### wp-themes-inactive (7) ###

UM Theme: version: 1.21, author: Ultimate Member
XXXXXXX: version: 1.0, author: MCCANNEX
XXXXXXX TwentySeventeen: version: 1.6.1528911410, author: the WordPress team
Twenty Nineteen: version: 1.4, author: the WordPress team
Twenty Seventeen: version: 2.2, author: the WordPress team
Twenty Sixteen: version: 2.0, author: the WordPress team
Twenty Twenty: version: 1.0, author: the WordPress team (latest version: 1.1)

### wp-mu-plugins (1) ###

ManageWP - Worker Loader: author: ManageWP, version: (undefined)

### wp-plugins-active (68) ###

Accordion Blocks: version: 1.0.6, author: Phil Buchanan
Better Recent Comments: version: 1.1.1, author: Barn2 Media
Change Author: version: 1.3, author: Martin Teley
Co-Authors Plus: version: 3.4.2, author: Mohammad Jangda, Daniel Bachhuber, Automattic
Comment Mention: version: 1.1.0, author: Bunty
Custom Post Type UI: version: 1.7.3, author: WebDevStudios
Duplicate Page: version: 4.1, author: mndpsingh287
Easy Username Updater: version: 1.0.4, author: Yogesh C. Pant
Far Future Expiration Plugin: version: 1.4, author: Tips and Tricks HQ
Galleries by Angie Makes: version: 1.67, author: Chris Baldelomar
Gmail SMTP: version: 1.1.9, author: naa986
Google Analytics for WordPress by MonsterInsights: version: 7.10.4, author: MonsterInsights
Gravity Forms: version: 2.4.17, author: rocketgenius
GTmetrix for WordPress: version: 0.4.4, author: GTmetrix
Guten Post Layout: version: 1.1.2, author: GutenDev
Insert Headers and Footers: version: 1.4.5, author: WPBeginner
Insert Pages: version: 3.5.2, author: Paul Ryan
Jetpack by WordPress.com: version: 8.3, author: Automattic
Mailchimp for WooCommerce: version: 2.3.4, author: Mailchimp
MaxButtons: version: 7.13.3, author: Max Foundry (latest version: 7.13.4)
MC4WP: Mailchimp for WordPress: version: 4.7.5, author: ibericode
MC4WP: Mailchimp User Sync: version: 1.8.1, author: ibericode
myCRED: version: 1.8.8, author: myCRED
myCRED Retro: version: 1.2.1, author: myCRED
Open Graph and Twitter Card Tags: version: 2.2.7.2, author: Webdados
Post Grid by PickPlugins: version: 2.0.44, author: PickPlugins
Post Type Switcher: version: 3.2.0, author: John James Jacoby
Product Visibility by User Role for WooCommerce: version: 1.5.2, author: WP Wham
Query Monitor: version: 3.5.2, author: John Blackbourn
Redirection: version: 4.7, author: John Godley
Remove Dashboard Access: version: 1.1.3, author: Drew Jaynes (DrewAPicture)
Require Featured Image: version: 1.5.0, author: Press Up
Smart Slider 3 Pro: version: 3.3.27, author: Nextend
Smash Balloon Instagram Feed: version: 2.1.4, author: Smash Balloon (latest version: 2.2.1)
SupportCandy: version: 2.1.1, author: SupportCandy
Ultimate Member: version: 2.1.4, author: Ultimate Member
Ultimate Member + WP User Frontend - Addon: version: 2.1, author: UDX
Ultimate Member - Followers: version: 2.1.8, author: Ultimate Member
Ultimate Member - Friends: version: 2.1.6, author: Ultimate Member
Ultimate Member - Instagram: version: 2.0.5, author: Ultimate Member
Ultimate Member - MailChimp: version: 2.2.3, author: Ultimate Member
Ultimate Member - myCRED: version: 2.1.7, author: Ultimate Member
Ultimate Member - Notices: version: 2.0.6, author: Ultimate Member
Ultimate Member - Private Content: version: 2.0.5, author: Ultimate Member
Ultimate Member - Real-time Notifications: version: 2.1.4, author: Ultimate Member
Ultimate Member - Regenerate Thumbnails: version: 1.0, author: UMDevs.com
Ultimate Member - Social Login: version: 2.2.0, author: Ultimate Member
Ultimate Member - User Reviews: version: 2.1.5, author: Ultimate Member
Ultimate Member - User Tags: version: 2.1.2, author: Ultimate Member
Ultimate Member - WooCommerce: version: 2.2.0, author: Ultimate Member
UM New Members widget: version: 1.0.10, author: Rogier Lankhorst
User Switching: version: 1.5.4, author: John Blackbourn & contributors
W4 Post List: version: 2.1.7, author: Shazzad Hossain Khan
weForms: version: 1.4.5, author: weForms (latest version: 1.4.6)
WooCommerce: version: 3.9.3, author: Automattic
WooCommerce - Autocomplete Orders: version: 1.1.4, author: Serious Plugins
WooCommerce Blocks: version: 2.5.7, author: Automattic (latest version: 2.5.14)
WooCommerce Direct Checkout: version: 2.3.2, author: QuadLayers
WooCommerce Product Carousel, Slider and Grid Ultimate: version: 1.7.1, author: AazzTech
WooCommerce Product Feed: version: 3.3.3, author: WebAppick
WooCommerce Services: version: 1.22.4, author: Automattic
WooCommerce Square: version: 2.0.8, author: WooCommerce (latest version: 2.1.0)
WooCommerce Subscriptions: version: 2.5.7, author: Automattic (latest version: 3.0.1)
WooSquare: version: 3.2.2, author: Wpexpertsio (latest version: 3.5.1)
Wordfence Security: version: 7.4.6, author: Wordfence
WordPress Popular Posts: version: 5.0.2, author: Hector Cabrera
WP Maintenance Mode: version: 2.2.4, author: Designmodo
WP User Frontend: version: 3.1.17, author: Tareq Hasan

### wp-plugins-inactive (71) ###
Notification: version: 6.3.2, author: BracketSpace

### wp-media ###

image_editor: WP_Image_Editor_GD
imagick_module_version: Not available
imagemagick_version: Not available
gd_version: bundled (2.1.0 compatible)
ghostscript_version: 9.05

### wp-server ###

server_architecture: Linux 3.12.18-clouder0 x86_64
httpd_software: Apache/2.4.39 (Unix) mod_hive/6.27 OpenSSL/1.0.1e-fips mod_fastcgi/2.4.6
php_version: 7.1.33 64bit
php_sapi: cgi-fcgi
max_input_variables: 1000
time_limit: 300
memory_limit: 1024M
max_input_time: 60
upload_max_size: 24M
php_post_max_size: 32M
curl_version: 7.59.0 OpenSSL/1.0.2r
suhosin: false
imagick_availability: false
htaccess_extra_rules: true

### wp-database ###

extension: mysqli
server_version: 5.6.36-82.1-log
client_version: mysqlnd 5.0.12-dev - 20150407 - $Id: XXXXXXX $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /home/XXXXXXX/public_html/wp-content
WP_PLUGIN_DIR: /home/XXXXXXX/public_html/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 512M
WP_DEBUG: false
WP_DEBUG_DISPLAY: false
WP_DEBUG_LOG: true
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable
mu-plugins: writable

### jetpack ###

site_id: XXXXXXX
ssl_cert: No
time_diff: undefined
version_option: 8.3:1583271664
old_version: 8.2.3:1582285306
public: Public
master_user: #2569 maestro ([email protected])
current_user: #4525 XXXXXXX (XXXXXXX)
tokens_set: Blog User
blog_token: XXXXXXX
user_token: XXXXXXX
version: 8.3
jp_plugin_dir: /home/XXXXXXX/public_html/wp-content/plugins/jetpack/
plan: free
HTTP_HOST: XXXXXXX
SERVER_PORT: 443
HTTPS: on
HTTP_X_REAL_IP: XXXXXXX
REMOTE_ADDR: XXXXXXX
protect_header: {"trusted_header":"REMOTE_ADDR","segments":1,"reverse":false}
full_sync: {"started":"Thu, 01 Jan 1970 00:00:00 +0000","finished":"Thu, 01 Jan 1970 00:00:00 +0000","progress":[],"config":[]}
sync_size: undefined
sync_lag: 0 seconds
full_sync_size: undefined
full_sync_lag: 0 seconds
idc_urls: {"home":"https:\/\/XXXXXXX","siteurl":"https:\/\/XXXXXXX","WP_HOME":"","WP_SITEURL":""}
idc_error_option: false
idc_optin: false
cxn_tests: All Pass.

I’ve removed all the other inactive plugins except Notification.