Last User Automatically gets Disabled

It has been a number of days now since I added a new user, and every few minutes, I have to enable the user. The user gets disabled automatically. when I view the history log it shows the user was disabled by the administrator after few minutes of enabling. Has anyone else ever experienced the same issue and got a solution for it? I’ll be glad if you assist me fix this issue.

Not able to replicate this…please share version details?

Version 11, cloud hosting