DemoPickup character can't be moved.

Hi, i'm a beginner of photon.
I got a problem with "DemoPickup".
At first, i open the demo, move the character, everything is fine, but when i stop moving, the character revert to initial position. so i can't move character normally.
I checked the "PickupController.cs" ,noticed the OnPhotonSerializeView is never be called. Is this a normal thing?