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Sometimes I get an notification of a new badge, sometimes I don't.. Is this a bug or are some badges not special enough to get a notification of?

My latest notifications

As you can see I got a notification of the badge, but just before that I also earned the cleanup badge, I noticed a new badge on my profile and found out I never saw that one before. So, why have some badges notification and others none?

marked as duplicate by Shadow The Curly Braced Wizard, Bart, psubsee2003, Aziz Shaikh, Martijn Pieters Nov 5 '13 at 13:45

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