iPhilMickelson: Scored Match Play must be included in this..
No it isn't included in the number, but it may count nevertheless. But, A/S is totally "out".
We can't read your story from here - too many hidden points.
There are several reasons why you might show so little ranked rounds, e.g. facebook play or mobile play. Another reason may be the matches that you played:
3 wins against Legends, two against TMs, ten against Masters etc. Each of these might have counted in if you were lower in tier than the opponent. Your small earnings may also have contributed...(?)
All these reasons are outside of our views, and WGT won't tell you (most probably). IMHO though, there ain't no sign of any miscalculation of average and tier yet.
Have fun!!