Giga, can you shed some light on this? I know there was talk update updating the functionality of GLBSE, but I'm not sure if it has been implemented. The previous behaviour would have bids fills starting at the highest price, and then for bids at the same price starting with oldest first.
I will consult Nefario today regarding this issue.
Looks like there are orders for around 370 out of the 500 remaining bonds. If you are looking to get in and haven't placed a bid yet, there is a bit of room left.