Hi,
So you have some view overrides ?
It look like there is a naming problem in your views.
While the quantity input is "hikashop_product_quantity_field_2", the javascript in the add to cart button is targeting "hikashop_product_quantity_field_1" ; so the script is not able to read the quantity entered in the input :
pasteboard.co/yFguRFKAB.png
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.