Party,

Not necessarily, I mentioned, on this forum a couple of years back, that I have this very problem, and nobody had an answer, including me.

There are a few tracks where my rating simply will not work.
Perth and Sydney, are some of them, actually. And yet the rest of the WA tracks are behaving as all the other winning tracks.
The easiest thing is to leave them alone, until you find a solution, or leave them alone permanent!
Good luck with it!