clarkwinkelmann can you describe in more details? Do you see any error message?
This is what I see. When i click one of them, it goes to the beginning of the related comment queue, but the comment doesn't show.
Are the posts still on the forum or where they deleted along with the user?
Apparently deleted.
You can always delete the flags directly in the flags table in the database if you don't find any other way. It should be safe to delete them manually with SQL.
I am not SQL-wise, would you care to suggest a console command to achieve it?