Hello,
1 - Full blank page = Please check your PHP error log.
(or force the display of PHP error message via your Joomla global configuration and the "error reporting" setting).
2 - There is no code in HikaShop to add a "strong" tag and I can't find nowhere a reference of " class=keyword" " ; so I think that you're using a third party (system) plugin which is modifying the content.
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.