Thank you for your promt reply. I really appreciate that!
Do you think i can replace the pool_wp_scorehistory table in mysql online with the local one where the ranking is properly calculated, so that users can see the correct ranking, without any consequences for the live system?
As the rest seems to work fine – except the ranking – i am not very keen on making any changes to the live system.
Could enabling the debugging in WP have any impact on the system? So if i understood correctly, when i enable debugging and add the code you mentioned, then i retrieve additional information regarding possible errors?
Thank you AntoineH!