When you either get an enchanted item, or an enchanted potion, or an enchanted golden apple, the enchantment goes through the whole entire item slot, not just around the item itself. (Note: This bug is when you are only looking through your hotbar, not when you are looking through your inventory, look at the pictures at the bottom for more information.)
Environment
Operatin System: Windows 8.1 Pro, 64-Bit Ram: 8 GB
Processor: Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz 2.50 GHz
Java Version: Version 8 Update 45 (build 1.8.0_45-b15)
You should really check this glitch out