>>538153542
idk
now that I look again your terrain texture seems fine and it looks to be a tiling texture that the rock textures are using
does it only happen in the reach? I know some textures can be region specific like that
I'd tcl and fly up to some of those weird textures to see if you can click on one of its meshes in console to get a name
like navigate more informative console with ctrl/shift to see its texture and try to troubleshoot from there