First, what is the code in box 7 on your 1099-R? This is the first thing to investigate - why did the pension administrator use that code (perhaps they should not have)?
Second, please review the Retirement topics - Exceptions to tax on early distributions to see if any exceptions jump out at you.
Third, I wonder if you were less than 59 1/2 when the original distribution from the 403(b) should have happened? Were you?
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