Hi,
I see the problem in your website, I am not able to reproduce it in our test websites but we have several modifications in the class filter since the last release.
In order to fix this problem fast, please provide me a FTP access so I will be able to apply the modifications in the class filter and check that it solve the problem ; I will also be able to create a new patch if our latest modifications are not for your specific case.
You can send me such private information using private message.
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.