CMS annual review - payments going down again.

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Every year I get less child maintenance and I'm wondering if it's worth it challenging this or not since they get their info from HMRC.
Ex is doing the same job, never stopped working during lockdowns, no change in the circumstances, so I'm just wondering how is it possible that every year he earns less money? Surely wages remain the same or go up not down?
Should I contact CMS and ask them to look at the decision again, or is it a waste of time as they get their info from HMRC and I can't really prove anything? Has anyone ever appealed and was successful?

Paying more into a pension? Could that be it.

I thought voluntary pension contribution too. I don’t know if there is a maximum amount amount allowed. If I were you, I’d ask for a mandatory reconsideration.

Pension payments or is he contributing towards another child now

Paying more into pension.