Hello,
Since you're using the "virtual coupon" mode (which is the default and best mode), you need to add a block within your checkout workflow in order to let the customer choose if he wants to use its points or not.
Without that block in the workflow, the default chose (to use points) can be no (depending your plugin settings, in the Joomla part of the plugin settings) and no discount would be generated.
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.