Does your spouse also work? If you have married filing jointly marked on multiple w-4s, you will not have enough tax withheld. There is a section of the w-4 that allows you to adjust for multiple income situations. Section 2 of the W-4 has instructions for situations where you have multiple jobs or your spouse works.
You only get one standard deduction. If you have multiple jobs and your other employer does not know about the other job, not enough tax will be withheld. See Why does my refund drop when adding a second w-2?, specifically the part about withholding credits and how to adjust the w-4s.
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