Maybe this isn't exactly a bug, but it's kinda weird when you click to see more comments and all it does increment the upvote counter on one of the comments.
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There is a case where a person can comment and then delete their comment and the "see more comments" will still be displayed. Somebody must have upvoted your comment or another comment prior to that sequence of events which led to your experience. The only update we notify on is for the addition of a new comment.