Turbotax inexplicably reducing my mortgage interest deduction for 2021

I refinanced my primary home mortage in December 2020 with a loan balance of $473,000.  My interest for 2021 was $12,053 (i.e., Form 1098 from my lender).  I entered this amount in Turbotax and that amount shows up in Turbotax on the Home Mortgage Interest Worksheet (line 2a); however, when I look at Schedule A in Turbotax it has the amount on line 8a as $5965?  Why is Turbotax showing a lower amount?