Sorting order in Wordpress with advance custom field

So I have a ACF called 'track_number' in order to sort each song (CPT) on the album pages (based on their taxonomy).

On the album page I run this loop to get the songs:

And for the most part I get what I expected minus one problem, the double digit numbers are jumping ahead (1,10,11,2,3...).

I tried to just put '0' in front of all the single digit fields but it didn't work. Ultimately I'd like to resolve it as is anyways. Any ideas?