Fiery Dragon Shoes proc on ally instead of myself

I’m playing coop with a friend and the firetrail procs appear on their feet when they are crit instead of at mine. Damage seems to scale based off their stats (so very low damage because they don’t scale fire damage).
When playing solo (same character) it procs as intended and the damage is higher (since I primarily scale fire damage).

They play Marksman, I’m Paladin with strong investment in support/buff abilities (which might be related to the issue?). I don’t use a weapon because I’m wearing Hand of Judgement.
My skill trees are

this happened to us as well, we’re both playing sorcerers and changing who was party leader didn’t fix it either