Thanks for pointing this out; we also see this discrepancy in our detailed accounting overview. Due to the high load experienced on our servers the balances have not fully updated. We will adjust any skewed balances once the load issue has been resolved.
My personal stats show:
Lifetime Valid: 76234 shares
Lifetime Stale: 165 shares
Lifetime Invalid: 317 shares
Lifetime Earned: 1.31083799 BTC
But according to your FAQ, ignore the Stale and Invalid, I should earn 76234 * 0.00002767 = 2.1094 BTC
So I still have 0.8 BTC not shown in my balance?