Hello bartalam,
This seems like an precision-related error, you could try to set the ‘Fractional Part’ flag to true on the Panner nodes, this should keep the precision of the Panner node up. If that doesn’t work there’s an option in the Material Parameters, under the Mobile Group called ‘Use Full Precision’ this will make the material more costly but uses more precise number types in the shader.
Just a suggestion, if you use the same parameters for the Panner nodes, you can scrap one and only use the remaining to drive both Texture Sample nodes, this makes the material a bit cheaper, about two instructions. So that’s not much, so it’s not that important, but will give you a better node graph.
Let me know if any of these suggestions work.
Regards,
Vecherka.