Landscape material problem on iOS

Hello, I have been working on a tower defense project, and I just started testing on my iphone 6. I have this landscape material that does not show properly on mobile. I read the other questions about this problem but couldn’t figure it out. I appreciate your help.

This is my landscape material.

Mobile Preview - some meshes are not displayed properly as well here but they are fine in my phone.

and this is my phone

The problem was the content I got from the marketplace. It had some textures with wrong size.