consolidation rules are not working as expected for parcel for order weight restriction

For Parcel shipments to be planned, we are trying to put a rule for consolidation that

1. Each order total weight should be less than equal to 30KGs
2. The total weight of shipment should be less that 99KGS
3. The total volume of shipment does not exceed 0.36M3

now in the configuration, we have constrained the rate offering

Weight Maximum to 99KGS

Volume Maximum to 0.36M3

In the rate record cost, we have put the condition 'Order Total Weight' < = 30KG

Now this is not working in all the cases and in some cases selecting orders more than 30KGs also. I believe this is only taking the weight of 1st order into consideration. Anyone has any idea if this is the correct way to handle this.