I have made it a habit to daily downvote the videos that have popped up on the White House YT channel. The result: a blue things down where there was previously a grey thumbs down.

Today I noticed that when I went back to look at videos I had previously downvoted, the thumbs down was grey and I could again turn it blue with my downvote.

Does this imply that my previous downvote had been erased?!