[Forminator Pro] Forminator doesn't save changes

I have a screen case but there is nowhere to attach it here.

When I update a field in a forminator form, the changes are not saved. I've tried reloading the page, logging out, using a different browser, but there doesn't appear to be any way to update the hidden-4 field in my form "Giveaway - Guapeando Tracks"

I cannot delete that field and add a new field because I have an integration (zappier) that uses the field name to match it to external sources after submit and as far as I can tell there is no way to manually set the names of the input fields in forminator.

So how can I update that input field? I've enabled support access.