+1 poison stacking

I think poison stacking in both passive tree, and gear are designed to work with anything that can poison enemies, as they do not specify a form of hit the player needs to inflict. however the skeletal summons are not able to proc this in any way, I have gloves that make it so enemies can be effected by +1 poison, and a passive, and yet the enemies are only getting one stack from the initial poison, and not the added +1 poison effects.