Won't change from standard to itemized deductions no matter how much medical expenses I put in!

There seems to be a glitch in the software. No matter how much the amount of medical expenses I put in, it keeps with the lower standard deduction on Line 12, Form 1040, even if there is a much higher deduction amount from Total Itemized Deductions from Schedule A. Please advise how to fix this glitch! There is no manual option to change to itemized deductions.