WowAce

What version of Grid2 and game type (classic or retail) are you using ?

 Retail

What game client version (windows or mac) and language are you using ?

 Windows, German

What steps will reproduce the problem?

  Simply open the raid debuff panel
Did you try having Grid2 as the only enabled addon and everything else disabled?

  No

Was it working in a previous version? If yes, which was the last good one?

  It was working, but I do not recall which version was the good one. It seemed the previous one was not working either. 

Do you have an error log of what happened? If you don't see any errors, make sure that error reporting is enabled (`/console scriptErrors 1`) or install [BugSack](https://mods.curse.com/addons/wow/BugSack).

  No lua errors. 

Please provide any additional information below.

 It seemed that the raid debuff panel suddenly becomes uneditable. For example, I can deactivate one of the skills (Steinstachel), but in fight it is still showing despite being deactivated. When I log out and log back in, it still shows that this skill is checked. I was unable to find a place to delete this debuff also, as I didn't see a blacklist option in this raid debuff panel. 

https://imgur.com/a/r9Jkwhi

Disabling and reenabling the shadowlands module in raid debuffs general settings tab should fix the issue.

You can go to [Custom Debufs] too and check  if the debuff exists there,  remove the debuff in custom debuffs if this is the case.

Thanks!