Hi,
If it is a bug, it is not a bug in HikaShop.
HikaShop can't display an article, so it means that it is Joomla which understand wrong the url and display an article.
But it could be a wrong configuration which would generate a non working url. What is your SEF configuration in HikaShop ?
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.