Schdule D Short term code verses long term gain code

[tpn]

My 1099-B lists all of my gains as long term but the TurboTax program shows them as part short and part long term. Why? What is the effect? How can they be changed. I have checked each security for being coded 'Box D' in the TurboTax screen.

[fanfare]

Always print a copy of your completed tax return for your records, and review it carefully before e-Filing.
You will need it if you are audited by the IRS, or to amend if a TurboTax update changes your return or for any other reason,

AND, to find your AGI next year.
AND,  to verify all your long term sales are properly listed on Form 8949 Part II with Box D, E, or F checked