You have the center upper clip installed on the the frame (green arrow). You shouldn't have any other upper clips installed (front or back of the panel - red arrows) because it won't install correctly (or not at all). The panel slots (red arrows) must clip on the upper door frame along with the center spring and bring the panel to a position almost touching the frame. If this has been done and put screws on the panel, you should look the door from the upper side and watch the gap where the door window comes out of, from front to back. It should have a smooth even gap where the thickness shouldn't be more than that of two door windows put together (I know rough estimate but I'm not with my Challenger right now). Also check if the door panel touches the door window too much because if it does, it may be pushing it a lot so you can't install it properly (but i think it's unlikely to be that).