Hello,
Yes, it is what I mean : the configuration of the element (module in your case) which have the issue.
The setting "filter same vendor" available in HikaShop modules is working for the vendor pages. It can also apply the filter if the view object have a "product" object.
But that setting did not work for the product pages ; so unfortunately the HikaMarket update cannot deactivate a feature which was not there before.
So I suppose that you have modified the HikaShop core in order to patch and add the feature ; modification you lost during the update since it restore all core files.
But there is no regression in the HikaMarket features.
Now, we can see to improve the core and see to implement a compatibility of "filter same vendor" with the HikaShop product page.
It is something I'm not found off since the code won't be flexible and compatible with possible HikaShop evolution.. That's the reason why I did not put that feature before and still prefer having a better solution for nicer implementation.
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.