Strange Camera Behavior on iOS - Runs perfect in Unity

Hey Guys!

I wanted to create a Draggable Camera in Unity. It works perfect in Unity itself (webbuild. preview and so on) but when i put it on my iphone it just acting weird. I can not describe it perfectly so I captured a video:

https://www.youtube.com/watch?v=jCmosezAP1g&feature=youtu.be

the first part is the ios part which is wrong and the second part is the mac/web build which is totaly correct. here is the camera script: http://pastebin.com/GBfw3tDq

and these are my settings: https://dl.dropboxusercontent.com/u/52617394/camsettings.jpg

could someone tell me please what i did wrong here?