The seller that matched your order was also using Commsec. That...

The seller that matched your order was also using Commsec. That means the two bids above your bid must be using some other broker other than Commsec. Brokers always/usually match sell orders to bids they have in the que before matching to other brokers. Can work in reverse also - your at top of the que but other bids behind you from other brokers can be matched in part or full first.

Regards

SP