After enchanting the crossbow with everything the game allows, all arrows began to show undefined behaviour (they worked fine before): they don't appear in the world, then appear in strange locations (see the screenshot, the arrow is stuck high in the sky), rotate (after I made the first screenshot, the arrow re-oriented, so I decided to make a second one) and teleport in a strange manner... Reloading the world doesn't fix the problem, but other worlds work fine.