what I am saying is very simple these users would have had to come from the coopermine database that was transferred over if you did not allow registrations. Now you should have two users since you created one of userid 1 when you installed Photopost.
User accounts do not just appear. You can check what is the proper userid for the user. See you have multiple users in coppermine look here.
Both Users Newleah Lost ôîòî è ôàíàðò. Ãàëåðåÿ Äæåéò ñàéòà - NewLeaX Ãàëåðåÿ Lost ôîòî è ôàíàðò. Ãàëåðåÿ Äæåéò ñàéòà - NewLeaX Ãàëåðåÿ
So at some point in Coppermine you had user accounts with another userid. You would need to move the photos under one user account and you can delete the extra user.