The top note was the anchor (i.e., #note_3304630) so it gets a "highlighted" background. When that happens, there's not enough padding for the avatar icon and the Delete icon, and it looks weird that there's a white gap to the right of it.
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@jschatz1@skyruler I dont agree adding padding on sides for active/hover state. It will "jump" all content wide/narrow which is awful.
And I think fixing it right now makes no sense unless we implement new sidebar (#3981 (closed)). At that time we can implement side padding in comments for all states.