My guess is that you must have imported the Pitch records a couple of times so your Pitch ID numbers got elevated. There's no easy way to fix that without redo-ing a bunch of stuff but you don't really need to. As long as you added your three Meeting records to P-024 and they have IDs of Mtg-01, Mtg-02 and Mtg-03, you should be ok for Lab 2b.
My guess is that you must have imported the Pitch records a couple of times so your Pitch ID numbers got elevated. There's no easy way to fix that without redo-ing a bunch of stuff but you don't really need to. As long as you added your three Meeting records to P-024 and they have IDs of Mtg-01, Mtg-02 and Mtg-03, you should be ok for Lab 2b.