I just found a bug with summoner armor. The extra damage they should give to summon weapons is a bit off. For example, the tiki armor should give a +30%summoner damage, and is only giving me like a +20% damage. The spooky armor should give a +58%, and only gives like +22-23% extra damage. Also, for some reason, the spider armor legs gives somehow a smaller boost alone that the other pieces of the spider armor, even if they give the same boost.
Tested a bit more and if I unequip any summoner and reforged accessories, then do the calcs with the armor alone, seems they work, giving the tiki armor a +30% boost, but the spooky armor is giving just a +33% bonus, so it completely ignores the set bonus.
I've been testing with a Lv150 demon medic with 149 charisma and int. The only comprehensible explanation to this bug is that the % of damage bonus is capped somehow and somewhere, but also is completely ignoring the set bonus, even from the bee armor.
Edit: tried with a fresh LV1 character. Spooky armor gives around a +48% summoner boost, but still not the +58% it should be