On BO QTY not Matching Orders Tab

The main tab under Item Maintenance is showing "on bk ord"=0 however on the orders tabs I am showing a total of 2 "on bo".  I just rebuilt the sort files Sunday night, and users are saying this just started happening recently, I cant think of anything that has changed.  I read about a possible issue with orders being imported, but I just manually entered an order and it did the same thing.