Currently, the bitrate sort is text-based, not numeric. In other words, in a descending bitrate sort 96 comes before 56 which comes before 128, all because it's a text sort on the first character (9 greater than 5 which is greater than 1), only going to the next character if the first character's the same. Since the bitrate is a numeric field, the sort should be numerical, showing a descending bitrate sort as 128, then 96, then 56.

Thank you.

This'll be in the next release.