What version you're playing would be helpful…
As would knowing which farm — searching shulkercraft+piglin+farm turned up:
Minecraft Easy Piglin Bartering/Trading Farm - 1.16 - YouTube [Jul 1, 2020]
Minecraft Easy and Powerful Piglin Bartering/Trading Farm [Jul 28, 2021] apparently based on gnembon's Piglin Bartering at 800000 items/h like a BOSS. [Fun Farms 33] [Jul 11, 2020]
Also any active mods & what (if any) changes to the farm you have made.