Numerical Sorting doesnt Work

For example, this feed http://www.fandango.com/rss/top10boxoffice.rss, when added doesn’t display in a numerical fashion. 10 comes after 1. A screenshot can be seen here http://postimg.org/image/ccm0j6dll/. Instead of 1, 2, 3, 4, numerically, the plugin sorts as 1, 10, 2, 3. Any help would greatly appreciated.

https://wordpress.org/plugins/wp-rss-multi-importer/