Hey Third Crusader!
While I do not have this permanently applied, and didn't come about getting it in the same way, I am too getting this on my Character that has the "Gloves of Power" equipped (collected off the goblin boss before the druid outpost)
I've noticed it applies the bane on hit as the item says but also applies it to the user? nothing in the flavour text indicates this should be the case.
Basically the same deal for me, equipped those gloves of power on my main PC and now every time he lands a hit on an enemy he is hit with Bane. It seems to be applying the opposite way it was intended to be.
Reading the gloves description it says:
Since our characters are non-believers by default I suppose that could be why it is getting applied in the manner it is.