Project Quote Not Calculating Total Sales (curyamount)

Hey, everyone - It doesn’t appear that the “Total Sales” field is calculating in Project quotes, despite being values in the “Ext. Price” and “Amount” columns.  This doesn’t appear to be an issue with hand-keying items line by line.  However, our estimates are fairly sophisticated and large and our estimating team will be making frequent use of the Load Records from File button and it only seems to be an issue when data is loaded in this way.  Is anyone aware of this happening either specifically or in a related way?  In full disclosure, I did customize fields on the screen but only by changing their display names and requirement status.  If you have any insight please advise.  Thank you!