The sold by works by taking the page the product is on, and grabbing the author of that product. I’m suspecting, that the quick view is not loading in that fashion, and instead, is seeing the shop page as the owner of the page, and showing that instead.
Since the Quick View is a third party plugin, or a theme option, you will probably want to raise this issue with that developer in order to sort this one out. There wouldnt be a way for us to fix this for them. 🙁