when 2 prefeb is spawn by photonNetwork.Instantiate, the vr cant look around.

I am using photonnetwork.Instantiate to spawn a prefab called VRPlayer. when only one VRPlayer is in the room, it works fine, it can move around and look around. but when two VRPlayer are in the room. both VRPlayer cant look around, the camera just fix in one direction but can move around. Someone please help!