What we humans get to look at is a very generic looking page with a nice sales message.
Chances are the page is cloaked.
The page you get, and the page that the search engine gets, are two entirely different pages. There's probably a lot of technology involved but a simple explanation involves something called an IP address that looks like this 282.262.273.22. Every computer connected to the internet has a distinct name or IP address, that is how the machines can recognize each other and tell each other apart. In fact, your domain name has an associated IP address, we humans use domain names because it's easier for us to remember names rather than numbers. When a computer comes to browse a web site, the cloaking software looks up the IP address to see if it is a known search engine.