Do you have a suitelet script that manipulates IF records? Have you checked those times where the context was Suitelet and that there's a suitelet that was executed in the account?

I found we have a WMS suitelet script that fulfills the SO when the warehouse employees scans the items with the guns. I am trying to find a way to find out the exact script but I am guessing I cannot do anything since WMS scripts are locked. So, I have to find a way how to make my userevent script work even for the IFs created via the WMS script.