Seems like a strange question, but how does the game determine how large an object will be viewed while in the Inventory Screen?

I ask because I took a bow, added a couple meshes to it, and now it is very large in the Inventory Screen. Beyond the viewing boundaries. It's normal size on the character. Minor-ish issue, but I'm definitely curious. Also I noticed that some other meshes I added to initially show up in the Inventory Screen with a top view instead of the normal side view. Weird.