[Resolved] No validation error after submitting registration form

I encounter some problems with the registration form:

– When I fill in the registration form and leave out the second password field it lets me submit the form but it shows no error and nothing happens.

– When I fill in the registration form with an emailadres which is already in use as a WordPress users, it validates but after submitting there is no error but nothing is happening

– When I fill in the registration form with an emailadres which is already in use the validator says it’s already used but I can still submit the form and get no error feedback.

How can I change this, I want visitors to get information when registering failed and why. Is that possible?

I’m using the most recent version and the Twenty Twenty-One theme

Kind regards,
Wen