I'll be happy to help with this, and I really appreciate the feedback.
So this is a known bug not related to the new builder, but one the team hopes to tackle soon.
This is strange behaviour; if you have a screenshot of this, it would be really useful if it's a bug in the new builder. Usually, this should only happen on a UID field. If the "First name" field is a UID field, then this is the expected behaviour.
I'm not quite sure what you mean here. Can you send me a screenshot for this as well?
I'll be very happy to switch you over to the legacy editor. Can you tell me which repo that is for so I can process this for you?