Reimburse items with sale prices

I don't understand why when I enter a sale price (excl GST) in the item window the price that the system gives me when I reimburse the item is different.  It does not seem to have GST added and I am entering into a sales invoice that lists prices NOT tax inclusive. We only use the base selling price and do not use levels (ABCD)

Screenshots attached.  Can anyone explain this to me?