I got to Track 7 & completed it, except I was never even notified that I completed it. Last I checked, it was on "Skill & Kill" 19/20 & never saw any other notification in chat box. Thus I did not even manage to claim the prize.
Next thing I knew, I was on Track 8 task (Smithing) automatically.
Here the same, completed Track 7 (mining) got notified I finished it, go to get reward and all I can see is that I have to do Track 8 (smithing).
No reward to finish Track 7.