Humm...that sounds like your forms has been corrupted (unfortunately, it happens).

Did you have backup of that form prior to modify it? if so, you will have to redo theses changes. I would go against the temptation of copy pasting them from the new (allegedly corrupted form) to the previous version as it could move the corruption over but you still could try might get lucky.

Simply make sure that you keep an untouched version of said prior version in case it doesn't work.

You could as well contact our support team via our website.
99 frigging bugs in my code
99 frigging bugs
Take one down
Code around
127 frigging bugs in my code