How does work "For each item from lootable ModId:X/X granted at x y z as item stack"?

I been trying to use this block to make a sound plays when a item is droped from an specific lootable. but the problem its that the sound sometimes plays when it not supposed to.

here is part of my procedure: https://imgur.com/a/dLPLIy8

here is another screenshot from the loot table pool:  https://imgur.com/a/NJwvXML

i would really appreciate if someone could help me with this trouble