Android Apps appear differently from their iPhone version. Some of the reasons behind this are:
- Android is an operating system that runs on over 5,188 distinct devices, so it is nearly impossible to create images that will look perfect across them all.
- There might be some slight stretching of images depending upon the specific phone's screen size.
- Also, Android devices are typically lower in quality and display than the iPhone which might also account for some small display discrepancies.
For information on the fragmentation of the Android market, see the attached article Android Fragmentation Visualized.