They are retained until you delete them. Usually the cause of this is that the form is actually under a different email address. Did you crete it in a different account?
Originally I thought so but when I signed in with the email accounts that it could be and asked to reset the password only one account the one I used now was found so I am not sure.
Randy you made me think and I just remembered my wife has an email account so when I signed on with that there the original form was. Thanks a bunch.