I just bought a brand new Matt Kechele as my first non long board, it's a 7'6 fun shape. After having it for about a month n a half now, on the bottom closer toward the nose, there are a ton of faint spider cracks.. I was using a roof rack at first (maybe 7 times), and i used it with 2 boards on there twice. Could this have caused it. Does this sound normal.