I was able to look into this with your files on the server and the problem was that you had the PowerGallery version of the HelperGroupRulesPHP.php file in the Security Assist folder in the root of the site. I reverted it back to the PowerStore version of this file using the SecurityAssist zip that is in this folder. It contains the original version of these files just in case something like this happens.
I tested after updating this file and it all seems to be working at it should be.