All your users have different userid's so they are different users like I showed this came from your coppermine. The Lea login came from when you setup Photopost before the import. As long as another login you have accesses admin you can delete Lea.
As far as your multiple logins you had in coppermine you can do as you wish. If you wish to move all photos of one extra user to the other user edit those photos and do so. Delete the users you dont want. Make sure you delete the correct ones though.