Mobile Expanded View Window Self-Closes Too Soon and When I Scroll

The grid version of the calendar is there on the mobile site, but when I click on it to expand the events of that day, the window closes too soon, and also closes if I scroll up or down. Our gym members are complaining that they can’t read the schedule. Is there a way to fix this? I didn’t see any settings for mobile to adjust.

Also, if I’ve already clicked on a certain day to see the expanded list of events, I can’t click on that day again unless I refresh the page.

Here is a link to the page:
https://pumpsfit.com/group-classes/group-class-schedule/

Here is my site info:

### WordPress Installation ###

Site Name: A WordPress Site
Home URL: https://pumpsfit.com
Site URL: https://pumpsfit.com
Version: 4.8
Locale: en_US
Timezone: America/New_York
Multisite: No
Permalinks: /%postname%/
WP Memory Limit: 40 MB
WP Debug Mode: No
Script Debug: No

### Active Theme ###

Theme: Pums Theme – 2.0
Child Theme: No
Parent Theme: –

### Active Plugins ###

WP101 Video Tutorials: 0.3
Simple Calendar: 3.1.9
Hustle: 5.1.3
Facebook Conversion Pixel: 1.3.5
Formidable Forms: 2.03.10
Post Types Order: 1.9.3.3
Advanced Custom Fields: 4.4.11
WordPress Importer: 0.6.3
MaxButtons: 6.20.2
Search Engine Visibility: 0.5

### Server Environment ###

Web Server: Apache
PHP Version: 5.6.30
MySQL Version: 5.6.32-78.0-log
Server Timezone: UTC
Display Errors: No
Memory Limit: 256M
Upload Max Filesize: 64M
Post Max Size: 65M
Max Execution Time: 30
Max Input Vars: 1000
fsockopen: Yes
cURL: 7.45.0
OpenSSL/1.0.1e
SOAP: Yes
SUHOSIN: No
WP Remote POST: Yes
WP Remote GET: Yes

### Client Information ###

IP Address: 107.180.120.39
Browser: Chrome 59.0.3071.115 (Apple)