When using the Short Buy screen we are needing to see the Purchasing Vendor Cost, the wholesale cost shows, but no one buys at wholesale cost. The Wholesale record that holds the Asterisk as Set Purchaser should be the Wholesale cost reflected on the Short Buy.
Here is how I get around that -
Go to +E-A, (or Keyop Menu, Specials, E-A). If you select 5 (Update Wholesale Cost), and base it on A (Purchasing Cost), then it should resolve your problem.