Hi,
The list you have circled in the screenshot are not session tracks, but individual sessions.
The session tracks are only available in the drop down list in the top right hand corner.

There is a N: N (many-to-many) relationship between the Session entity and the Session Track entity. So they cannot be uniquely identified with each other
And the session tracks cannot be registered in the marketing application. Only sessions can be registered.

The number of registrations of a session track is actually the sum of the number of registrations of the sessions it contains.

If this helped you, I'd appreciate it if you'd mark this as a Verified Answer, which may in turn help others as well.
Best Regards,
Nya