Based upon the info you provided, I believe that $14250 is the correct.
The standard deduction for Single or Married filing separately is $12,550.
The addition for over age 65 is $1,350.
Add these 2 together and you get $14,250.
Refer to https://www.irs.gov/publications/p554 This publication includes a standard deduction worksheet with you can locate by using "Find" "Worksheet 4-1. 2021 Standard Deduction Worksheet" or by using Find "$1,350".
Thus, unless you are blind, or have other unusual circumstances, the $14,250 is correct.
If you need to, check to ensure your birth date is correct. This date is located under the "Personal Data" tab, located at the top left of your screen, under the TurboTax logo.
