Turbotax is recommending to take my itemized deductions, but its less than the standard deduction?!?!

I just finished my federal taxes for 2019 on turbotax.  I have filed "Married filing jointly".  What's very strange is that my itemized deductions are about $20,000, and its telling me I would owe less taking the itemized deduction over the standard deduction ($24,400).  This does not make sense to me?!?!   Even if I "force" the standard deduction ($24,400), it still shows that I will owe more... even thought the summary total deduction line is higher.  Any ideas?