Discounted Amount not reflected in Total Due

Hi guys, I hope someone can help me please.
I applied a 25 % discount to an invoice and it displayed the correct total, but after I sent the invoice, the invoice did not display the discounted amount in the total due slot, but the full amount!

I tried changing settings at Localisation and everywhere I could find anything related to applying discounts, but it still continues to do this when I send or then save the invoice.
It shows the sub-total, it shows the discount applied and then at the total, once again duisplayes the full sub-total before the discount is applied!
Any help would be immensely appreciated.

did you work it out?
it works for me.
in the LOCALIZATION tab in settings, scroll to the bottom there is a line item "Discount location"
hit the drop down menu and click "BOTH LINE AND TOTAL"
this should fix your issue