@shabti
I am also facing a similar problem
I have been creating forms with Frontend Admin. Recently I noted that that all my existing forms made through Frontend Admin plugin have been disappeared and now even unable to add more fields in new forms as well.
After I restored my website to an earlier date, diagnosed that it is an issue with recent update of ACF plugin ver 6.12.
I don’t know how to avoid updating this plugin in future as well.
Can you please guide me on this?
I shall be really thankful