Landscapes on mobile:
Component sizes larger than 128x128 vertices are not supported, for example 127x127 quads with 2x2 subsections. Larger component sizes would require more than 65536 vertices in a vertex buffer, which will overflow the 16-bit index values. Attempting to use a larger size will cause rendering corruption. In this situation, setting MobileLodBias=1 will solve the problem as it reduces the number of vertices in the component.
That was causing the disruption 
Maybe this “disruption” should be visible in the mobile previewer as well?
Edit2: Maybe it has also do with scaling of the texture coordinates. Not sure if this max component thing is still valid.