This question already has an answer here:
I was a victim of some serial upvoting, see the post, The strange case of the waxing and waning reputation, on SE Raspberry Pi. Nothing particularly new or amazing in that, granted. However, during, and as a cause of, the serial upvoting, I was awarded the "Nice Question" bronze badge. The votes have, rightly, been removed by the system, but I still have the badge in my collection.
Here is a screen shot of my reputation changes, showing that the votes have been removed.
Here is a screenshot of the badge being awarded due to one of the serial upvotes.
Here you can see that I still have the badge awarded.
Shouldn't I be stripped of the badge, in the same way that I was stripped of the reputation, if it was awarded as a by product of someone's thoughtless upvoting?