Redstone Duplication bug (Hopper)

Put the summary of the bug you're having here

What I expected to happen was...:
What i wanted it to do was put it in the trapped chest, Not duplicate it

What actually happened was...:
I created a banking system, Once finished i tested it with redstone,
I noticed it output 2 when i put 1 in the hopper, So i went experimenting with it
Its a bug with the trapped chest i believe
Steps to Reproduce:
1. Press q over a hopper, facing a trapped chest
2. Look in the chest and there should be 2 if you did throw in one