Yes, there have been some obvious race conditions - especially with the web results or on gnome/linux with the listing of open browser tabs.

In a similar vein the browser search bar keeps remembering things you mistype once, and if your automatism is to type "n" and then press enter to go to "news.ycombinator.com" you will end up on the wrong page over and over again, because internally it keeps a counter and ranks higher depending on number of times you have "clicked" it.

Quite annoying UX with many search bar implementations and it makes me feel like the people who design these are not actual power users of their own software.