Well, that is at least hypothetically possible :-). For instance, if you have a 20,000 standard deduction with $15000 of ordinary income and $20,000 of long term capital gains and dividends, that might happen.
What I recommend, though, is that you go over everything, on the IRS forms, and make sure of the following:
1) all your income is appropriately reported
2) you've checked all the numbers and understand how the result is reached
3) now you either know why it is possible or you have an idea where things need to be corrected 🙂
