Form Unstable

I started creating questionnaire with 10 questions, then the form goes error and everything disappears. I now have to restart.
I am signed in and yet when I try to access, I am asked to login. When I try, the same email address that shows me signed in on one tab says the email is not recognised by kobocollect.

Even right now, after I have signed up again, activated account and posting this, I am trying to sign in and create a form. Now the same account is not recognised.

Welcome to the community, @kadjekum! Could you also let us know the server you are using?