Panner expression doesn't work as expected on mobile

I have a panner expression node connected to cloud texture in my unlit material,and this material is applied to plane, it’s working fine on both PC and mobile views, but when I install the app on my Nexus 5 ,the panner will only loop once, i.e: the cloud goes from start to the end of the plane !!.

Am I missing something or there’s an issue with the mobile ??