Unkillable spiders

when a unique barrel box was next to a diviners box.
after finishing the unique barrel first i then clicked the diviners box which had a tag revives dead monsters it then revived some time brown spiders that were untargetable and unkillable and they kept attacking me and i couldnt finish the barrel reloading into map didnt help and aoe ground didnt help thanks please fix

I just had this happen to me. I was confused and I kept getting stunned by small untargetable/unkillable spiders.