January 16, 2017
Duplicate form issue in 5.0.8
1: Export one copy as a backup.
2: Delete the first instance of the form.
3: Try to edit the second instance. Change something, even if you just add a comment. Save the form
4: This should succeed verifying the form is still valid and you should only have one copy in the list.
This seems to happen if a worksheet had previously been initiated using the form and you are editing it again for the first time after that initiation. This state triggers a new version of the form to be created.