After you file

I did my ID check on 5/7 so my DDD of 5/15 is accurate, it will be about a week later. I hoped but didn't expect to get it this fast honestly, I'm still surprised. They did take out quite a bit from "past IRS debt" which I had NO clue I owed until I saw it on WMR this morning. I mean I always paid my taxes... anyone know how to find out exactly what they took out for?? I'm happy to get my refund but a little bummed it's not what I was expecting.