In this pic, the leading edge of the glass looks off.
look at the stainless trim. It is off by about 1/8 inch in the pic.
I'm betting the vent window frame is off.
Best way I found to adjust it was to loosen up all the adjustment points and start slow, moving the frame gradually until its correct. Get some one to assist you.
BTW... This adjustment is a pain in the *** to get right so have some patience!!
