Today I received the Yearling badge on Math SE (hooray!). I have always thought it was interesting (not bad, just interesting) that badges (but not rep) are distinct between regular Math SE and meta Math SE. Just as it is on other SE sites.
However I noticed one odd result of that. On both Math SE and meta Math SE, I have the yearling badge twice! i.e. it says x2 next to it, in my profile on either site.
Is this a bug? If badges are separate across the two areas, which I believe to be the case since no other badges are shared, that would mean I actually have FOUR Yearling badges.
At most I should have just 1x on both sites, giving me two Yearling badges. This seems justified since while I have not been active on meta, it would be awkward not to award it here since rep is shared.