After migrating to Joomla 3 strange backend

-- HikaShop version -- : 2.2.0
-- Joomla version -- : 3..1.5
-- PHP version -- : 5.3.3-7+squeeze15
-- Browser(s) name and version -- : Firefox 32

When opening component hikashop in the backend the top row of menus is showing as plain text in the blue Joomla header. See attached file. How can I fix this?

You need to change the "menu position" option of the configuration to "above the content" and that will display fine.