Recently, I’ve downsized my gaming area and use a couple bookshelves for Atari and NES game storage. Since I have so much, I’ve had to stack my NES carts around ten carts high per stack and my Atari carts almost 15 high per stack. Is this safe? I’ve started thinking excess weight might warp the plastic shells on the lower carts. Should I worry or is it just my OCD talking? Does anyone else keep their cartridges like this and have any problems?