Hello kindly tell us more about your solution
Level 6. I found out the problem. User manager has a glitch. If you create a profile on the user manager and then remove it, it no longer shows you the profile on the user manager. I'd you go to the terminal on the winbox or login via telnet and goto tools user-manager profile profile limitations you will find that the profiles are still there.
My problem was that I did some testing profiles with the same name, after I removed them, I created the profile I was going to use. Since ask my test profiles and my real profile had the same name, users kept getting transfer from one to the other profiles.
To bad I found this out after I deleted all 3000 accounts I had created.
Hope this helps since none had ever posted a solution for this issue.