Hi,
If you're using HikaShop 2.6 with Joomla 3.x ; there is no more "menu / module" in HikaShop part, all is now accessible in the Joomla menu configuration.
And when you edit a "category listing" menu ; you will have two tabs in the Joomla menu edition, one for the category listing and another for the product listing which will be display just below the categories.
If you empty the trash with old content modules ; it means that your current category listing menu has not been migrate to the new system (because HikaShop have a retro-compatibility support).
So you need to edit your category listing menu and set the all configuration for the category listing and the product listing too.
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.