Hello,
The option "Give points when using some" is related to the usage of points to have a discount.
If you are using a HikaShop coupon for the discount, it would requires details about the way that discount are handle in HikaShop configuration.
You configured the plugin to give points only on products in a specific category.
So the plugin process the prices of all products within that category. It does not include the coupon since it is not a product and that the coupon is applied on the entire order (so it can affect products which are not in the selected category).
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.