Bug 331,484,386: duplicate charges, visually, using Sanctum Mystery Box pets

Steps to reproduce:
1) Be a Hierophant with Conviction of Power, giving 4 minimum power and endurance charges.
2) Equip Galloping Vilemorph Pet in pet slot 1
3) Equip Spiky Vilemorph Pet in pet slot 2
4) Equip the currently-in-use Spiky Vilemorph Pet in pet slot 1

The result is

5) Unequip the Spiky Vilemorph pet, such that you now have no pets equipped.

The result is

I haven't tested if other people can see this. The effect goes away when changing zones.