Doesn't sort track properly

Problem with the tracks named by the following pattern:
^(\d)*(\D)*(\d)*

E.g:
    1-16. Race the Minefield.m4a
    1-14. Maureen at Work.m4a
    1-21. The Resolute.m4a
    1-06. Danger Will Robinson.m4a
    1-22. End Credits.m4a
    1-03. Will Exploring.m4a
    1-18. Here We Go.m4a