You missed a question at some point. Turbotax will ask how much did you forfeit or roll over. Because you skipped that question (or answered "zero" incorrectly), the program assumes the entire $3000 was paid out to you.
I would re-run the dependent care credit interview. The question might also appear in the W-2 interview when Turbotax recognizes an amount in box 10. (I can't remember from the last time I had a DCB and I haven't tested it this year.)
