@Pug,
it's correct to double the 9 hole scores - 33 => 66.
Average is calculated from the results of the current tier only, you know that?
From your 27 or 28 ranked rounds as a TM (uncertain about the 31 on STA on 05-29-12), I also can't calculate to your current average.
As a NATION member, have you played the weekend tournament, one or two rounds?
These are "secret" and don't show in your stats but in the average.
Add these results - does it help?
Edit2: If you shot a combined 143 your ave. calculation will show the correct 67,23, including the STA result.
Edit: 200 results are in the "score history" on your profile.