If you have one Gang rate with multiple resources and the total does not match, check if the gang is doubled or if one is missing by following the path in the Estimating screen:
Click Search Items
Select List
Choose the item you want to verify
Now ConQuest will show you a list of all the items with the gangs you selected, and you need to check each individually.
Once you found the issue, you can add the correct gang.
The totals should match now.