Looks like you just need to move the thin white cable connected to the ‘C’ terminal next to zone 8 to the 24 - terminal next to S2.
While making adjustments, I would also move the second common thick white wire from the leftmost C terminal to newly available C terminal next to zone 8. This way you have less chance of connector fatigue in a long term. Idea is to have just one thick white cable connected to each individual C terminal.
Cheers,
Gene