its not yourself is it. sometimes you can have two forms open at the same time, which causes this problem.
secondly, does this mean you have some record locking turned on. Personally, i wouldnt bother. optimistic record-locking is generally acceptable in most cases. once you turn record-locking on, you do have to think about design, so that the user with the lock will hold the lock for the least time possible, and release the lock asap. You dont want a user opening a form locked, and going to lunch say, leaving a record locked for an hour or more