Textures appearing incorrectly on mobile

You will need to change one asset in the engine to fix this issue.

  1. In content browser view options set ‘Show Engine Content’ checkbox
  2. Find ObjectScale material function in the Engine Content
  3. Change it to match attached picture

Also it will be better to change your materials that use tiling, specifically all materials that use UV_CustomTexture function.
Right now texture tiling calculated in pixel shader, it’s better to move it to vertex shader.
Like this:

You can read about Customized UV here