hmm, maybe yours is different. Does it open both ways? as in it can slide all the way back so u can stand up. but if u go the other way it will just pop the rear side up on an angle getting some air in? Cos if i go to close mine and i hold it, it will just go past the "close" point and start opening, so i have to kind of stop it and hope im at the right spot as for water to not seep in. Sorry for bugging you, just got car and wondering if it was meant to be like that or not. Cheers.