One other plausible explanation is that your Earned Income Credit has decreased with the addition of the second W-2.
The Earned Income Tax credit (EITC) is a bell-shaped curve against income. The EITC rises with income until a certain level of income when it starts to decrease to reach 0 at the maximum level of income for the category.
As an example, please look at the EITC tables from page 27 of this IRS publication.
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