Hi,
As Mohamed already said, there is no "Brand: xyz" being displayed by HikaShop on the product page.
If you have that text displayed on your product page, it's likely to have been added on your end with custom code. Which is why Mohamed asked you to provide the show_default.php file to see if you had changed something in it. I checked it but I don't see any code related to the brand.
So I don't know how you added that brand display so I can't tell you what code you used for that and in which file.
If you could give a link to the product page, I could have a look at the HTML, that may help.