shipping price applied twice

-- url of the page with the problem -- : www.miawear.com
-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3
-- PHP version -- : 5

I don't understand why the shipping price is applied one time if I buy one product, but two times if I buy two or more products...

The product you see alone in the attachment has not difference to others

Hello,
Your issue can be coming from the fact that you used the Price per product" option through your shipping configuration page ? Can you show me how did you configured your shipping method through some screenshots ?
Thanks.

Hi Mohamed,
no I didn't set the price for product.
here the screenshot.
thank you
e.

So I think that your issue is coming from the fact that you have set a warehouse through your products configuration page.
If you use the same warehouse or unset it, you'll see that it will use the same shipping method.

no I didn't (and I controlled not to have done for error)
we only sell our products so we did't set any warehouse

ok resolved.
you were right, is the warehouse, i use the italian versione and I checked the wrong field.
Thank you
Elena