The post could have been more clear in what you wanted. But I am assuming you're asking if the problem you are describing (the rear hatch pulls itself closed and then pops open after a few seconds) is normal and what can be done to repair this issue.
Assuming that is the question, I can't give you a definitive answer other than, "It ain't s'posed ta do dat." I need some more details of what exactly is it doing?
Is the motor actually pulling the hatch closed and secured and THEN popping open on its own. Or does the hatch try to pull closed but eventually just gives up?