Balbao Forms does not store admin and CC recipient email addresses

I currently have the problem that I can save you as the admin and another email address as a recipient.
As soon as I have entered the email address - saved - I can go back into the field and the email addresses are deleted.
I have this message from my customer on several websites.

https://www.loom.com/share/d90480d1222f4a3b93cd6dec4f90130a?sid=9e51a818-2171-4844-bbc4-dac08a0c8e66