It is actually sorting by bug task creation timestamp rather than bug creation timestamp.
Bug 35574 has a "gail (Ubuntu)" task created on 2006-03-19 and a "gnome-panel (Ubuntu)" task created on 2006-09-18, which accounts for the ordering.
I agree that people would generally expect the list to be sorted on the bug creation date.
It is actually sorting by bug task creation timestamp rather than bug creation timestamp.
Bug 35574 has a "gail (Ubuntu)" task created on 2006-03-19 and a "gnome-panel (Ubuntu)" task created on 2006-09-18, which accounts for the ordering.
I agree that people would generally expect the list to be sorted on the bug creation date.