Caching Issues on Login Modal

When a user with a “Customer” role tries to log in. The “Sign-In/Join” button does not change to “Logout”. This however, does not happen for users who has an Admin role.

I was able to identify that it is WP Fastest Cache which is causing the issue when I tried to disable it and the login worked fine.

I also tried adding “Customer” as an exclusion to Cookies but that didn’t work.

The page I need help with: [log in to see the link]