Pixel Perfect on iPhone

Hi, I am making a 2D game for the iOS and I have a problem with pixel perfection...

I've done everything right for pixel perfect game and it works great in the editor and if I build it for computer, but when I try it on my iPhone 6 (and I have set the resolution to 1334x750) it doesn't work perfectly, it still jumps a little. There are much larger jumps and glitches when I don't set it pixel perfect, but when I do it still jumps just a little bit... Any idea what this might be?