Item Glow glitch

Almost all (save a few) "shiny" items (Bottle o' Enchanting, enchanted books, Nether Star- you know the shiny effect I'm talking about) have a shine not only on the item, but in the whole inventory slot it is located in. In the image attached, you can see that the slot selected is not affected, but the other slots are. The glitch is evident in the third slot.