'Made more money' usually equals 'owes more tax', so you actually just answered your own question!
You may have gone up into a higher tax bracket, too. Your husband might want to check his W-4 Withholding and adjust that amount.
It's always good to contribute more to a company retirement plan to lower your taxable income, if you are eligible to do so.
Here's some additional info:
https://ttlc.intuit.com/replies/3301788
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