It is possible depending on the other items on your tax return.

The usual culprit is when other items become taxable due to the increase in your other income - i.e it's possible that more of your social security benefits would become taxable because of the increase in your other income sources.  The increase in AGI could have also caused you to lose eligibility for or a reduction in some of your adjustment to income.

The best thing to do is to print out your Form 1040 both before and after the changes and compare them line by line to see any of the other potential changes.