When you entered your additional W-2, it increased your income. It could have put you in a higher tax bracket and/or it could have decreased some credits on your tax return. There's no way we can tell you exactly why your refund decreased without reviewing your tax return.
Review the TurboTax Help article Why did my refund drop when I entered a second W-2? for more information.
If your income increases in 2025, then you will have more taxable income, so your taxes will increase. You will end up owing if you don't have enough taxes withheld from your paychecks.
The IRS has a Tax Withholding Estimator that you can use to help you figure out if you will need to increase your tax withholding for your jobs. Use the Tax Withholding Calculator here.
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