why is screen 3-5 missing units from approved change orders?

We entered original budget with units (quantities) and a few approved change orders with quantities.  But original quantities and only part of the change order units are appearing in the 3-5 budget screen.  The 3-5 budget screen is leaving off part of the quantities that were entered in approved change orders.  We have to use 6-8-2 or 6-8-3 to get the total hours and units.  What is causing this?  We are testing using a project with little activity so we can track the changes easily.  The hours are updating correctly.  The units for the original budget is showing correctly.  The quantities for changes are very randomly showing up in the 3-5 budget screen.  In order to get accurate totals we have to review the 6-8-3 screen