Auburn - 1 (win)
Alabama - 2 (win)
Tennessee - 2 (win)
Texas A&M - 4 (win)
Missouri - 6 (loss)
Mississippi State - 8 (loss)
Georgia - 9 (loss)
Vanderbilt - 10 (loss)
Arkansas - 10 (win)
Texas - 11 (loss)

So six of the SEC teams have been the higher seed, but that also includes an 8. There isn't really a distinction between an 8 or a 9.

There have been two upsets for SEC teams (if you count a 9 beating an 8, which isn't really an upset). That's offset by pulling out an upset with Arkansas over Kansas. So it sounds like the SEC is doing exactly how expected.