Gamertag Checker retrieves the recently played games and general profile information for gamertags on Xbox Live. This can be a useful way to check whether or not a particular gamertag exists and is already taken.
To check a gamertag, simply enter a gamertag and whether or not you want to include their recently played games, and then click the Search button.
Don't worry — it's perfectly normal. Xbox Live data is constantly in flux and rarely universal. Some factors that may affect data include: