Fields Multiplying every time I update proposal

Every time I try to edit the form the fields of the form keep multiplying. If I try deleting them, more come back after I click update. It’s a new site set-up, using WordPress default theme, Twenty Twenty. I doubt it’s a plugin issue, I only have these plugins installed:
`Flamingo – Version 2.2.2
Gutenberg – Version 11.2.1
HubSpot All-In-One Marketing – Forms, Popups, Live Chat – Version 8.4.5
Jetpack – Version 10.0
WordPress Importer – Version 0.7
WP Proposals – Version 2.2

Not sure what is happening with the WP Proposals.

The page I need help with: [log in to see the link]