>>114902813sites visited in incognito can still read your existing cookies, incognito just prevents them leaving new cookies that persist after that tab is closed, it doesn't hide your IP or any of the other leaky shit you're dragging around incognito, like your logged-in facebook/twitter/whatever
for example if you're signed into google, google records your history even if you're in incognito mode, because the privacy is browser-side, not server-side where you're logged in
those are still based on your previous search results