Reduces Prices

hey guys, got some troubles in calculating my subtotal price for reduced price items, like:

http://www.sharkyg.com/woo/150002.pdf

“Zwischensumme” / Subtotal is calculaterd from the standard prices, instead of the reduced ones.. any idea how to change it? it should be 3×236,36 and not 3×277,27? the tax on the other hand seems to be correct …

BIGthanks
greg

https://wordpress.org/plugins/woocommerce-pdf-invoices/