If you don't have important topics and posts in the forum, I recommend drop the _wpforo_topics and _wpforo_posts tables and create them again using the button.

Also, make sure your MySQL server is 5.6 or higher.

attached is the screen shot

Posted by: @astridff

And this one.

 Annotation-2020-08-07-183005.jpg

Hi @astridff, 

What is your MySQL Version? 

You can find this information on 

1) Forum Dashboard 

2) Scroll Down, it's under "Server Information"

For wpForo to function as designed, the MySQL version should be

"MySQL version 5.6 or greater"

More Info on wpForo Server Requirements:

https://wpforo.com/docs/root/wpforo-installation/server-requirements/

Also, you can and deactivate other plugins and test it one by one, to also test if there are any plugin conflicts that's causing the errors that you are seeing on your forum.   

Good luck and God bless you!  :-)  

As described in the screenshot provided by you, first, please click on "Solve Database Problems" buttons and check again.

The button is located in the Dashboard  >Forums > Settings > Debug > Tables tab.

If "Solve Database Problems"  button doesn't solve this issue, please use the "Problem fixer SQL commands" SQL command below in your hosting service cPanel > phpMyAdmin Database Manager > WordPress Database > SQL Tab. In case you're not familiar with hosting service tools, please contact to your hosting service support team and forward them this message with the SQL command.

web address is https://expatsportugal.com/community

... lets see what happens now

Yes please keep us informed.