I seem to get this weird rendering glitch when I made a simple terrain. I cant seem to fix it.
Here is a link to the image: Screenshot - 274a10a8ffa4cbd11986393bd875946c - Gyazo
Screenshot - d076aea95cda9dd618325a0ebade5a0e - Gyazo
Did you ever tried to reset the components of terrain.Sorry I cant help you because I saw this issue first time