I fear I'm not explaining the problem properly. So I'm attaching a screen-shot of what the problem is, exactly.
As you can see from the screen-shot, the selected combo-box is displaying a number -- the correct number ($275.00) -- in the main display area. But in the combo-box's drop down, are two completely unrelated numbers ($315.00 and $325.00). If you were to select, say $315.00, the displayed number would change to $255, and the next time you open that combo box, the drop-down would show the proper numbers ($255.00 and $275.00). I hope that helps to explain the problem, if there are some folks out there who aren't understanding it. Thanks, L.