At the POS when we enter an incorrect item number the item not found window pops up, we then hit the ESC to continue and to pop up the search window.
The problem lies in if we close the search window without searching it will add an item to the sale.(the same item every time and not the one auto selected in the window) This will also happen if we close the item not found pop up. I have looked at the item in the database and cannot see anything that makes it unique.