Duplicate Cost

I managed to make 2 automation agents

1-To adjust shipment ship unit net weight to be as same as attribute 11 in shipment using DSU

2-Agent using Recalculate Cost at event shipment - modified

The setup is as follows

1- Run Tracking Event (X) to update attribute 11 in shipment

2-Agent # 1 runs and update shipment ship unit to be as same as attribute 11 in shipment

3-Base cost is adjusted automatic once shipment ship unit net weight is updated

4-Agent # 2 runs (Recalculate shipment cost)

The issue is that base cost is adjusted but 2 base cost shown as duplicate in addition of duplication of accessorial cost as shown in the following screen shot.