Inaccurate vendor expense allocation across accounts in report "Expenses by Vendor"

Inaccurate vendor expense allocation across accounts in report "Expenses by Vendor"

When I run the "Expenses by Vendor" report, this is a partial result:

Drilling into this expense, I see the following detail:


However, this $5245 is NOT all for Certification Fees.  It was actually split across three accounts when the banking transaction was reconciled:  

The drill down results are wrong, and so is the Excel file that I can export.  Both show the entire $5245 attributed to Certification Fees.  How can I get an accurate reporting of vendor expenses summarized by account?  Thank you!