I just got a notification that I received the Vox Populi (use 40 votes in one day) badge, but my user page shows I've only made 2 votes today (which sounds about right; I certainly didn't vote on 40 questions and answers today). Is anyone else getting a notification like this?
We just deployed a change that affects the voting badges. This is why you see a number of these badges being awarded.
For more information about this change, you can see this answer.
Note that there is a bug with Vox Populi only that is awarding too many of them, beyond the expected more for retroactive awards, and a fix is being deployed now. The erroneous awards there will be cleaned up shortly.