I am using TurboTax Premier 2022 on Windows 10. Open supporting details for a line that is currently empty. Type anything into the description box, and then tab to the amount box and type a number with more than one digit. Tab to the next line, and repeat. When you get to the amount box for the 12th line, the program accepts only the first digit you type and ignores all other digits. If you were able to type more than a single digit into the amount box on the 12th line, you may have scrolled before you tried to type into the amount box on the 12th line.
