I have this problem too and its not just when re-ordering the tracks.
I actually just recreated 10 tracks in one folder, adding them in the order I want them to display. When I view the live page, they are no longer in the order I added them. I then tried to re-order them using the drag and drop facility but they still won;t.
Small but frustrating issue with what is otherwise an great component.
My database alreay shows mysql so changing database type from "mysqli" to "mysql" isn't the answer.