ESPP

I have a 1099-B and form 3922 regarding 2 sales from an ESPP.  In one transaction the 1099-B reports that we sold 38 shares and the corresponding info for that transaction on the 3922 reads that we transferred 31 shares.  If I enter that in the interview process for the 3922, turbo tax asks me to fix an error accounting for 7 missing shares.  Please help.

 

Thanks