Forum:Reborn mod terrain glitch?

Recently i bought terraria and got reborn mod with it. Ofcourse Tconfig and launcher also, When i go into the game all the time if i go deep enough the terrain will glitch and go between transparent and like appearing there...I wont fall through the map though..I dont know how to fix this, The game is playable but this is annoying to deal with trying to play the game.