How accurate is the "Accepted MH/s (Last Hour)" and "Rejected MH/s" (Last Hour) fields?

Im mining with 2 cards at 480 khash and about 4% stale shares.
But the stats page is listing them as 0.38 and 0.37 with a blank rejected field.
Where is the missing 210 khash? Thats 20% of the hashing power not accounted for.


http://middlecoin.com/#1HrJZEj4fLaxi5UaPMEFPSAfP6KELdBSmy
http://middlecoin.com/#1KkWcM1Vw8JvYnTVLsJFypCmd1hiV934XV