Hi,
The CSS problem is strange but the thing that I am sure is that, you have some javascript error in the webpage.
The upload field is not hidden (the "Durchsuchen..." button) so it means that the HikaMarket javascript is not call so, there is a javascript error before.
After that, the icons are displayed thanks to CSS classnames. I have to check the page in order to understand why there are not used correctly.
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.