Turbo Tax Update on 4/4 significantly changed my tax bill/refund.

My question doesn't seem to fit a particular category so I am starting here.  Last month, mid March, I sat down and completed my return.  Sat on it to think about it to make sure I did not forget anything.  At that time I had a tax bill of around $1,000.  I went in today, 4/4/21, Turbo Tax updated with the latest information and before I touched anything I now have a refund of $78!  Has anyone had this experience?  My previous entries are there, just seems odd for such a significant swing.