Yes, it's possible an employer is not withholding the correct amount. Also you should compare your returns line by line 2023 and 2024, to see what exactly changed. This would include your federal withholding amounts for each of you. It is good to get to the bottom of it.
You can determine going forward whether the correct withholding is done. In the link below is a employer withholding guide that you can use to compare the gross wages of each of you and the pay period. Find the amount each employer is withholding. Notice gross pay and the pay period chart (weekly, bi-weekly, etc)
This will tell you what the employer is taking and allow you to make necessary adjustments. You can make adjustments as many times as you need to and submit to your employer.
@Khr77
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