password protection stopped working

Hi. Our password protected pages are not working. Our host added a firewall to our site. Now our password protected pages are either not protected, or access is strange (enter the password and the screen just refreshes, but you can open some of the sub pages - but not all of them). I spoke with the host and they said this is a theme issue. https://wellnesswarriorsboston.org/ --> I've removed some of those pages from the menu for now, but all pages under the MEMBERS should be password protected. Help! This is rather critical! Thank you for your help. Alice