I visited the profile of a new user and found this. It seems he changed his forum name and the changes he made before that are now from a deleted user ("gelöschter Benutzer").
Could be that the "ElkArte-Version" is a custom field asked in the registration page?
I think I've seen something like that already, when a custom field is filled during the registrations these are saved in the log of profile edits are stored as made by a guest (that is not entirely wrong because when you select them you still are a guest, though it's indeed a bit odd).
Yes it's a custom field. Oh, okay, thought it could be a bug. I can live with this, I was just curious.
I tend to consider it a bug, and I think it is tracked somewhere, not sure where though... :-[