quantity discount calculation wrong

[qingtianyu9]

I installed discount_1.7,it's great,but,there is a mistake,quantity discount calculation wrong:


sub-total is $603.09,but quantity discount = $607.09 * 35% = $212.48,The correct expression should be quantity discount = $603.09 * 35% = $211.0815, sub-total is $603.09 not $607.09 , where is the $607.09 come form????

[qingtianyu9]

Correct form->from,,
more Screenshots:

admin:

[qingtianyu9]

includes\modules\order_total\ot_quantity_discount.php
line 114,change
"return $currencies->format($amount, true, $order->info['currency'], $order->info['currency_value']);"

to
"return $amount;"

the Culprit is format function.