It looks like the spacing for the number of the track is only set for two digits. Once you get past 99, it won't allow for a space between the number of the track and the title.
I did get it to work by inserting a " " before the titles. That allows for a space between the track number and title. (I didn't sort through the code to find where to correct it. Hard coding a space seemed like a quick fix.)
It's not something that would probably come up often, but I have quite a large number of short audio clips (400+).
(BTW, I did do the drag & drop to let it number itself, but that only works up to 99 titles. After that the numbers and the titles run together.)