I’ve recently got the staff Harvester’s Interdiction from Ara-kara.
It’s currently 626ilvl and the staff tooltip says:
“Equip: Your melee attacks have a chance to inject volatile black blood into your target, inflicting 47,080 Shadow damage over 3 sec.”
But when analyzing the damage the proc did overall in the dungeon it’s really low compared to the tooltip as it says instead “23 shadow damage over 3 sec”
Multiple people have stated this issue in the wowhead page for that item https://www.wowhead.com/item=221159/harvesters-interdiction#comments
I believe this is a bug but not sure if this is the correct place to report it