Can`t change Form order for Project, and can`t switch between forms in PFTW

So in PFTW, in a form of Project table, if we go to form settings, we have Form Order setting, there we can provide the order of the forms, every time I try to set them and save I get this error:

And also the ability to switch between forms it`s missing, this happened after I switched to a form once, and then that button disappeared

It also seems that this error only happens for my user, another user is seeing the button for switching forms.

What may cause this and how should I fix it?