Bug for down voting?
Today I was doing the Spanish course with my Android phone and I wanted to check the comments of the sentence "La noticia viene del imperio." Once I got in, I saw a downvote had been given from me to the top most comment. I thought I must have accidentally tapped on the down arrow because, as a novice in Spanish, I could not have down voted anyone.
Then I scrolled down a little and found that a series of 5 or 6 comments were showing a down vote from me. I didn't see these comments before and it is not quite possible to have tapped 5, 6 down arrows at the same time by accident. Is there a bug?
You should edit your post to move the discussion into the troubleshooting category.