Hi,
I did not understand your problem.
Your first link is broken but I have tried with another product.
I see that the look is different between the first and the second website but I do not see something "broken".
The added "span6" classname does not impact the CSS files, it is an extra classname with is compatible with Bootstrap. All existing rules are still working with it.
Could you explain more your design problem. Maybe with a screenshot ?
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.