Why did TT use the Standard Deduction with my deductions exceeded that?

Upon completion of our turns, TT tells me that my wife and I had $26,900 in deductions, yet TT used the Standard Deduction (and I'm not sure I could even over-ride that). Odd. 

It's probably no big deal because it was close (and is the first year we've never itemized - due to the limits on State and Local taxes at $10K).

Still, why would it do this?