Bid Grid Accuracy

When using the Bid Grid, the results show 0 trips went below me when I can see on PBS 3XP several went below my seniority %. I wonder why. I only have a few basic bid properties in like turns, and release times and it shows 0 in June. Even if I move my seniority to what PBS 3XP says it was in June (which is a lower %), the results still show 0 below me.