Ah, okay, so semantics is what we are hitting.
If you look at the description for tracking
You will see it states "replies to your post" (emphasis is mine)
What you want is "Watching"
It seems the only way to elicit Watching is manually switching it (by changing the drop down, or using the keyboard combination m, w
Or by watching categories (in your preferences), which auto-subscribe you to all topics as they are created within that category (this is what I do).