Aperture information is different between desktop Lightroom CC 2015 (Windows 7) and the Android mobile app (Samsung S6). I've noticed this on a few photos and a few lenses. For example, when I look at some photos that I shot at f2.8 with a Canon 70-200 f2.8 IS II, on the desktop version of Lightroom the information is correct, but on the Android version the information says f3.0. Similarly, when shooting at f5.6 with a Canon 10-22mm, the desktop version shows f5.6, but the Android version shows f5.0.