There are some freaky names in the system (both, the new and the old) related to the usernames. Some users have different names in the archive. A good example is ‘Züberle‘ which was called ‘Zueberle‘ and ‘Z?erle’ in the old system and resulted in ‘Zueberle’ and ‘Zerle’ in the new system.
This is the reason why you should never use special characters in your usernames, filenames or folder names ;). However, we have a procedure to simply merge such users with multiple names which has already be done with Zueberle.
If this happened to your user as well or if you see something suspicious in the archive please let us know! Thx!