Email field is gone in registrationform

I replied to another topic about this (https://www.ads-software.com/support/topic/password-field-in-registration-form-has-disappeared/) but as this is a very urgent problem for me, I start a new topic on it to.

In the field settings of every registrationform the email field is gone. There is a small empty field that I think was the emailfield but it’s empty and I can’t modify or delete it.

On the front of the website the registrationforms still have the emailfield but it doesn’t work right, the registration mail is send to no emailadres.

Please help, my site is not accessible to new users now ??