when you add multiple states to a file, then add a timeline, by default the timeline is only active and visible in the correctly mapped state. (as it should be). After going into this state with the timeline active, and going back to another state when the timeline is not active, you can now see the timeline, which doesn't effect the content of the form editor (because it's not mapped to this state.) This timeline should only be visible in the state it is actually mapped to.