issue with building unity VR google cardboard

I need help with my unity project, I am facing issue with building VR google cardboard with the free asset on Viking village, using My Mac device and my iPhone (iOS) , after I built the game in unity , then transferred that game to my iPhone X , the game environment keep rotating without my control or interferences just rotating!! , same issue, I couldn't solve this for 2 days , Any help please? Thank you.