There are a number of variables here. First, are you in a state where Social Security is taxed? That is, as you know, the amount of Social Security that is taxed varies between 0% and 85%, depending on your other income.
Since you reduced the "outside" income (the summer job), then perhaps there is no Social Security being taxed this year in your state, reducing your tax bite.
As for your summer job, you may have been under withholding somewhat, causing the normal amount you owe. But this year, if you did not include the summer job, then your net tax situation may have improved.
So, lacking any other information, this may be a perfectly reasonable result.
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