has anyone else had problems with the rear platform panel at the top of window where the 2 panels join bowing out or cupping ? for some reason mine bows out leaving a gap between the two panels that sandwich the rear window im sure everything is lined up because screws all went in ok its like the panel is slightly bigger than it should be unfortunately i only noticed when the rear frame was fixed in place and the rear outer panel was on and im loathe to strip it all back off as it was a pain to line up and fix in place