Textures On my Terrain Getting Messed up when Importing new package

I recently Downloaded the Medieval environment pack from Manufactura K4 on the asset store but whenever I import it my terrain textures get messed up. Im pretty new to Unity so Im having trouble figuring things out. I made a terrain in TerrainComposer if that matters. If anyone has any ideas or can point me in the right general direction that would be great.

Heres a picture of how they look

The pack you downloaded probably has some special scripts for terrain. Does it come with a scene? If so open it and examine the terrains to see what yours is missing.