Why when I boot from my bootable media do I only see one ConfigMgr / SCCM 2007 Task Sequence as being available to run in the Task Sequence Wizard?

I’m trying to build a machine. I insert my boot media. The machine boots and into PE and the Task Sequence Wizard runs. I click “Next >” on the “Welcome to the Task Sequence Wizard” screen.

However, on the “Select a Task Sequence” screen I’m only seeing one ConfigMgr / SCCM 2007 Task Sequence as being available despite there being several that should be available.