What us the number on Game Centre icon for?

[SomeDudeAsking]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

My Game Centre icon has a 2 on the top right. What is that even for? I looked inside Game Centre and there aren't even any requests or messages. It seems like a bug in iOS.

 

[Pink∆Floyd]

It's not a bug.

 

[iphone1105]

It's not a bug.

friend requests or game invites, not a bug

 

[slayer41]

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