Why is the list of tracks on my CD different from the list appearing in the List Pane of Windows Media Player?

I am a cataloguer in a Library. Currently I am attending to a collection of music CDs . Part of the process is confirming the content of each CD by playing it using the Library’s equipment, in this case Windows Media Player.

On more than one occasion, the list of tracks appearing on the disc label or container has differed substantially from the one appearing in the list pane of the Media Player. Why is this?

I also note that sometimes the duration of the CD will appear in the List Pane and sometimes it does not. Is this an option in the Player that I am missing?

Lastly, I note that these problems are rarely seen with more established publishers such as Decca. Almost always the problem CDs come from small desktop operations.