Thank you. My theme is Foodie Pro. I have been using this theme for 4 years but just updated to 3.1.0 last week. I have had no trouble prior to this, so maybe more a plugin conflict? Here are the plugins. Most are old, but maybe a newer one. I will star the recent, within 3 months.
Anti Spam Bee
Cloudflare
Cookbook Recipe Plugin
*Cookie Consent
*Easy Update Manager
Featured Images in RSS
GM Block Bots
Google Analytics Dashboard for WP
Lightweight Social Icons
Login Lockdown
Mailchimp for WP
Rename wp-login.php
*Scriptless Social Icons
Subscribe to Comments Reloaded (using for about 4 months)
Tasty Pins
Tiny MCE Advanced
Updraft Plus
WP Crontrol
WP Fastest Cache
WP Missed Schedule
WP Rollback
WP Optimize
WP Forms Lite
Yoast SEO premium
*Yoast SEO Search Index Purge
I am using the native comment form for WP and my theme.