I only can login with "kali" user

hi! I have this problem running kali on VirtualBox:

I can only login using the login screen with the default kali user. If I try to login with any other user the screen freezes or the login fields keep popping. When I am logged in, I can su “Mi user” without problem, also I can sudo su. Anyone have any idea what is the problem? Creating new users doesn´t work either.

Thanks!