Analog film photography and cameras

The thing that really galls is the visible outline of the film-roll perforations on the top of the first shot. It's present on most of the roll. How does that happen?

Is it equally visible from first to last frame, and equally visible from left to right on each frame?

Apart from that I really don't think the results are too bad by the way,
it's not a pro-lab, is it, and your sunny 16 metering might be off at times too, so..