It could be due to many reasons. Without seeing your tax return, it is hard to say. It could be you did not withhold enough taxes with your employer or you might not have answered some of the questions correctly thus miss certain credits and deductions. Would you like to have somebody to look over your return?
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before you entered the educational credits, did TT say you OWED 1508 or were getting a refund of 1508? your question isn't clear on that item.
and how much are your federal tax withholdings on your W-2s? that could have something to do with it also.
Did either of you receive any 1099-MISC documents?