Sorting breaks on US thousands separator in numbers

[pmi123]

A data entry of "1,310.1 ft" is not sorted correctly. Please take a look at my jsfiddle - https://jsfiddle.net/pmi2018/7etqo15k/21/. Be sure to select the "show 25 entries" in the top left corner, and then sort the Altitude - ft column. The other columns (Weight, and Altitude - m) sort correctly.

Thanks for looking into this!