Hi,
Your performing a search in the category "product category" but in the product directly in that category ("sub element filter" is set to "direct sub elements").
Because you do not have any product in that category but you have your products in sub categories, the filters can't find anything because there is no product where it is looking.
You should change the sub element filter into "all sub elements".
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.