Upon delving deeper into the issue: it is probably due to the Core Graphics coordinate system. If the programmers would check which coordinate system is being used for handeling the drawing, the output can be put right for all hosts.
Probable culprit may be the use of direct Core Graphics calls (which yield far greater power over graphics) in stead of UI graphics calls (which compensate for any coordinate system mixup)…
See for instance (but this may be iOS related): stackoverflow question 2695262: “how-to-compensate-the-flipped-coordinate-system-of-core-graphics-for-easy-drawing?”
(sorry, new member, can’t post links).