It depends on the Data Center I believe. Same as with Google search. There is no one search result for everyone. It depends on the DC, if it gets updated already or not. Also your location against your app settings matter. The game types you've played till now also have an impact on your search results. Google tries to show you games which are most suitable for you/your interest.
Last year I've released a trivia game and we were doing paid marketing, so we were getting many people daily and still had to wait hours for the DC to update. And even though we have thousands of downloads, I've seen the app on different position from Poland than my friend from UK.
EDIT: BTW I see it on the 1st position.