Yeah, it doesn’t look great in the flesh either. It sits really far off at the top.Every pic you’ve shared looks pretty similar to my last van which I cut and installed Kombi side windows - however the mastic sitting above the glass on the rear window would irritate me and does not look to be very well installed.
I did suspect that they should all follow the curve and sit in the aperture. I understand the bottom may stick out a bit further than the rest but would still expect it to not be visible when you look down the side of the van.