Hello,
Regarding the fact that you're in market mode "Store paid directly" and you include the taxes in the vendor price ; I'll suggest you to not use "products" as "vendor payment content".
Because HikaMarket have to aggregate the products to deduce the sum ; the taxes might not be processed rightfully in that mode ; the default mode (order) should work better.
Regards,
PS : You indicate your HikaSerial version number instead of your HikaMarket one.
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.