Posted by: @danju92

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WP Fastest Cache is set correctly also.

Firs you should delete all caches, then check the database issues in Dashboard > wpForo > Tools > Database tables Tab. If you see any issue, just click the [Solve Problems] button.

For the cache plugin, you should do the following:

WP Fastest Cache plugin

1. Please navigate in Dashboard to WP Fastest Cache > Exclude Tab
2. In the "Exclude Pages" section click the [Add New Rule] button
3. Select [Start with] option in the drop-down menu and insert the URL path(s) of your forum page(s) one per rule in the next field:
   

   /community/
   /participant/
   /sign-up/
   /sign-in/
   /change-password/

4. If you have more than one forum pages (boards) you should create separate rules for each forum board.
5. Save rules and delete all caches.