did you lie about your birthday when you signed up? 
Or maybe it happens for the day you signed up. something like that.
It’s a mystery. It happened since yesterday (I think), but never happened before.
I love beer, but not love cake, though I’m not unappreciative.
It’s the anniversary of when you signed up 
If you hover over it it should say what it is. (on a pc anyway)
Happy 5th Anniversary 
Oh ….