Thank you for the question. Your financial advisor probably has significantly more information about your joint financial picture then this question presents.
When your W-4 Part 1 filing status is checked as Single, income taxes are withheld at a higher rate then if the filing status is Married filing jointly. Your financial advisor is most likely attempting to account for income other then on the W-2.
Assuming this is what your financial advisor is recommending, I would also recommend that you account for most of the additional income by using these two resources:
TurboTax's W-4 Calculator
TurboTax's Tax Caster tax calculator
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