A typo in the state and local section of the w2 would cause a difference.
If you have the LIVE service, an offline review will allow comparison of last year and this year. See What is a tax expert written response and how do I get one?
To compare the last 2 years and this one would be on you to compare the forms and find the differences. If you can give us what has changed, we are glad to find law changes and help however we can without seeing your return.
Video: Why is my refund lower than last year?(0:59)
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