Shields will only trigger the attack once per shield, however they trigger the debuff as many times as they are used. seems to be bug, The issue is stacking Hercule Pavise's. See my build below I replaced everything with buckler for safe non-debuff infinite run.
yeah that probably works, but the problem is that the fact that this is a bug and you normally wouldn't need to go through such roundabout measures to avoid it
weapon was only activated 9 times and has a 21 damage debuff