well what it does is that it takes the total numbers of people who voted already, in this case that's 25 atm, and then it calculates the % of users who have voted for the show. For instance, a show with one vote will have 4%. The reason why the sum goes over 100 is because there are multiple votes allowed
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And so it only calculated the percentage of users who voted on that show. In the example of the show that got 1 vote, the percentage of users who voted for the show will be 4%.
So the question to your answer is: Yes it would be weird if people were only allowed to vote for 1 show, but it isn't weird because people are allowed to vote for one than 1 show, and every vote gets as much weight as any other vote. For instance is someone votes for show X and 9 other shows also. The vote for show X will be worth as much as the vote of another user, who only voted for show X. It's the number of users who vote for the show that count.