It's not necessarily the "wrong" form. It just likely means you didn't have enough total itemized deductions to use Schedule A and Form 1040. You get one or the other - either the standard deduction or itemized deductions (mortgage interest, property taxes, charitable, etc). When you enter all your individual itemized deductions, TurboTax will compare the total amount to your eligible standard deduction ($6,350 if single, $9,350 if head of household, or $12,700 if married jointly) and give you the larger deduction. So, in your case, the standard deduction was likely still larger than your itemized deductions.
