Discount & Minimum Quantity

I created a discount for a product for 15$ and his original price was 93$, means now it is 78$ per item.
I elso created minimun quantity for 2 items for 75$ instad of 93$ minus the 15$ discount = 60$ from 2 items.
In the product page it displays good, but when i add to cart 2 products it calculate the price wrong.

It calculate like this:
150$ (2 items worth 75$ each) - 15$ discount (ONE TIME) = 135$

Which suppose to be like this:
120$ (2 items worth 75$ each - 2 times 15$ discount).


Reply fast please.
Thank you.

EDIT: found another thing wrong..
At the final stage (confirm order) and the cart total the cart is displaying tax free while the cart description is displaying the 135$, the cart total is -taxes.
The final stage is tax free - discount and the final comes like 110$ or something like that...
I do not recall messing with the code there.

Importent to mention that only products with discount act like this.

Thank you agian

Thanks for the replay.
Ok i ran a check with all the changes i have made and it seems like listing_price modification changed the value of the discount apparently this line:

echo $this->currencyHelper->format(-1*$this->row->discount->discount_flat_amount,$price->price_currency_id);

I have changed this line to display full price with strike on it:
echo '<strike>' . $this->currencyHelper->format($price->price_value_with_tax + $this->row->discount->discount_flat_amount,$price->price_currency_id) . '</strike>';

So i guess format save the value somehow.
How can i display the full price instad of this - discount without damaging the value?

Thank you.

Great, done.
Thanks again.