There is a post here in which the fellow is experiencing the same exact problem as me I think. I am guessing that the post was closed to replies because you do not want ot fix this for many people, but I would appreciate if someone could have a look at mine. It is exactly the same as the other guy explained.
http://www.gravityhelp.com/forums/topic/cannot-delete-individual-input-fields
I can email admin my ftp details if possible . I would appreciate it. Just bought my first form from you 5 minutes ago and it to is unusable.