Hi,
It's the option "Menu position" from the HikaShop display configuration.
Please select the value "Above the main area" in the HikaShop configuration, tab "Display".
The option is set automatically to this value during the installation of HikaShop on Joomla 3.0, but you can still change it in the configuration panel.
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.