Hi,
I've tried without a coupon and the total is correct both in the checkout and PayPal:
take.ms/85pZh
take.ms/2xCxj
The issue apparently comes from the fact that the discounted amount is taken into account for the calculations of the shipping. Turn off the "Include virtual products price" setting of your shipping methods, and enter a weight in your products and you won't have that problem when using coupons.
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.