Can't completed on bulletin board at Mysteria island

[Eis]

I’ve completed the “Complete 5 Personal Requests” quest on Mysteria Island — the progress shows 5/5 and I received the 15 points. However, the bulletin board still won’t mark it as completed. The quest appears done, but it doesn’t register as finished and I can’t fully complete the board.

[Eve]

It's a bug, seems to be if you completed it before unlocking the board.

[Felix333]

it happened to me aswell but i did not get the 15 points and now i can't finish the progress to the last level as they are still missing.

[Raeilgunne]

same

[DasGrob]

There are multiple Threads to this topic.
Wait for fix and Hope they'll fix it. I'm stuck at that Board too.
Fingers crossed!