£23m - Is this the smoking gun?

Reviewing my thread (£600 Million at risk - answers to questions required) I was suddenly struck by the following posted by "nearly" at 17:48:


Runner Bet ID Placed Date Category Bid Type Status Stake (£) Liability (£) Odds Matched
Voler La Vedette  17677809015 28/12/2011 14:06:17 EX B Matched 22.00   22.00

Voler La Vedette  17677802348 28/12/2011 14:06:01 EX B Matched 22.00   20.00

Voler La Vedette  17677798827 28/12/2011 14:05:51 EX B Matched 11.00   21.00

Voler La Vedette  17677793270 28/12/2011 14:05:35 EX B Matched 11.00   23.00

Voler La Vedette  17677781170 28/12/2011 14:05:09 EX B Matched 11.00   21.00

This seems to be a straight cut and paste from the email he/she received from Betfair notifying him/her of the voiding.

Looking at the time of the bets and the Odds Matched there is an obvious question in my mind:

Why are the odds matched not at 29.00?  Given best execution guaranteed by Betfair why has he/she been matched below the 29.00 that was clearly available at this time?

Before I jump to wild conclusions can someone explain what am I missing here.