I’m getting this error trying to load my 300 submissions from Pro Forms, in Bricks System Information all is in green.
Is this about the form submission overview in the backend? Unfortunately, I can’t reproduce the issue—even with many submissions, the display is correct for me. We also have support access to many of our users’ websites, many of which have hundreds of submissions that are also displayed correctly.
Could you post some information about your server environment? 
Also, can you try to deactivate all other plugins and check again?
Hi Danielle, thanks for your reply. I indeed tried deactivating all others plugins (ACF, CoreFramework, BBQFirewall) but nothing seemed to work. And yes, is from the submission overview in the WordPress Dashboard. It’s a Pro Form of like 31 inputs (in them like 4 of max 5 photos/images and 1 video max 10mb).
The team was doing some pentesting (also the found that it is possible to deactivate the hCaptcha protection for spam) and did like 300 submissions, so idk if something could have done wrong with that.
Here is my server info:
After I reset/deleted all the submission data (from the Bricksforge settings) the error is gone and now is working.
Who is your hosting provider? Do you use an external WAF?