Simple animation shader doesn't work on mobile.

Hello fellow mobile devs,

I have a problem with animation of my shader on mobile, it works fine in editor.
Here is the shader, all I am doing is multiplying half of my texture with black and half with white and I am moving this black and white band.

This is how is suppoused to look like (how it looks in the editor (the sahder is for progress bars)

And this is how it looks like on my mobile (there is some strange thing going on there)

I try to use clamp instead of saturate in my shader but still the same.

I would apreciate any help.

Thank you.