After update product admin page destroyed

-- HikaShop version -- : 2.5.0
-- Joomla version -- : 2.5.28
-- Browser(s) name and version -- : Firefox 39.0

Hello,
I updated Hikashop from 2.4.0 to 2.5.0 but when I want to edit a product in admin or add a new product, the page is destroyed as you can see in the attached picture. Could somebody help me fast with this problem?
I need it to fix for my customer.

Thank you.

Hi,

That's because you don't use the default CSS of the backend of HikaShop, and thus you didn't get the new CSS necessary for the new product edition interface.
Change back to default the backend CSS setting of the Display tab of the HikaShop configuration and it will display fine.

Hi,
thank you very much for your help. It helped.