Hi,
Without more details about your configuration, your categories and what you have done ; it will difficult for us to have any useful tip or clue.
The only advice that I can give you is to check your cache (Joomla cache, plugin "cache", template cache, etc).
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.