All I googled was my user name if you check the vendor list at rendo I don’t show up at all. This showed up using google it was on about the fifth page of links. It wasn’t that I was looking at rendo to see if I was a vendor. Rendo wasn’t even part of the search terms…
Google basically uses bots to fill out its search contents and tries to determine if a URL and its parameters lead to “unique pages” and if so this is a potential search result. This can be steered by web pages, so Rendo could specify (and probably does) what Google should be allowed to “crawl” for example or which URLs (and parameters) lead to the same content.
In your case Google found that specific URL and provided parameters - could be for various reasons, e.g. it could be linked somewhere on Rendo, a place you may not be able to see, but the bot perhaps could - and it led to the result page getting indexed as search result and you found it then.
I’d probably point this out at Rendo. There is/are certainly a bug/bugs when it tries to fill out your (non existant) vendor page and there may be another issue with regards to their Google bot configuration.