ZorinOS not logging in anymore

Hello guys, I am using Zorin in one of my pcs and I had just transferred all my files to it in order to make a home server with it.
Curiously, it started not logging in. The password is correct (otherwise it shows an error in red) but I can not log in anymore.
Can anyone help me solve this please?

Video here: Login bug

Hi, this sometimes does happen. Please view the unofficial manual for Zorin 15 here:

Then once either opened online or after downloading, please go to page 179.