Attachment taken from here.
47.83%
34.78%
47.83%
21.74%
8.70%
21.74%
13.04%
4.35%
0%
34.78%
---------- +
234.31 %
Which is more then 100% :)
The problem is that the percentage is calculated from the total voters and the votes. In this example there are 23 voters, and for example 11 votes for C++, which is indeed 47.83. But it's fails to take into account that 1 voter can make more then 1 vote.