A curious thing happens when many users vote for the same option in a poll. Initially, Discourse shows only the first 25 voters, so as not to overwhelm the page, but clicking the button to show more votes shows only one or two more votes. You can click the button repeatedly until it shows all the remaining votes – but all the remaining votes appear to be by the same one or two voters, based on their profile pictures.
This user hasn’t voted 51 times! It seems to be a display bug that happens to different users depending on how many votes the server returns when you click the button. This is just a heads-up to anyone who’s reading these polls that you don’t need to be alarmed about voter fraud.