Can't edit stateless form

Can't edit stateless form

When I try to edit a stateless form (add a field, etc.), nothing comes up except the "Insert fields" menu. So I can't even delete the form. It still shows up when I access the application. I can view the form actions and field actions in the script editing section, but when I try to see the "form definition" sections, it just says "loading....".

Where did these parts of this form go, and how can I at least delete it if I can't regain editing ability?