What steps will reproduce the problem?
1. Install StatStain
2. Install Bagnon
3. Play

What is the expected output? What do you see instead?
The item tooltips should show the item count of which character on your account has whatever amount of an item such as if the item were coal at the bottom of the tooltip it might show:
Jimbob:  (20 bags)
Larry: (5 bank)

When you have StatStain and bagnon(bagnon_tooltip to be exact) together you get double the item info so you would see:
Jimbob:  (20 bags)
Larry: (5 bank)
Jimbob:  (20bags)
Larry: (5 bank)

What version of the product are you using?
Latest of both.

Is the problem in Bagnon_tooltip/Bagnon_forever or is it with StatStain?