Hi,
I see that you're using a restriction on a category and also a restriction on the vendor.
Are you sure that the other restriction are right set-up ?
Like, if you remove the "discount target vendor" restriction ; does the discount visible on the products ?
Otherwise, when you create a topic, please check the version number you provide ; because HikaMarket 3.6.2 does not exist and you're not using HikaShop 2.6.4 but HikaShop 2.6.3.
Version number are very useful for the support team to know if you can be affected by a known bug or not ; providing a false information won't help the support team ; and by the way ; won't help you.
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.