Once, I voted on an answer. 20 minutes later, the answer was edited, and I realized I erred on my vote. After changing my vote, I realized I erred again, but I knew it was too late. Nevertheless, I felt like clicking it anyway, and learned something bizarre.
According to the white text, I did not vote after the answer was edited. No, I travelled 20 minutes into the past and cast a new vote then.
The time should reflect when I actually last voted, if it is going to state 'last voted'. An alternative would be to just remove "last".
Also, it's really hard to report and tag these kind of things when you don't even know what to call them.