Retirement tax questions

Doing my 2024 federal tax return, I entered my various 1099s in TurboTax's Income section. After finsihing with Income, I went on and several screens later, possibly in the Review section, I was asked if I "used" any of these 1099s in 2024. Several of my 1099 forms were listed. I didn't understand this question and no explanation was given.  Answering "No" would delete the forms, which didn't seem right. Answering "Yes" took me to additional screens where I had to re-enter all this info. Fortunately I reviewd my 1040 and saw these income amounts were entered twice. I went back to the Income section and sure enough, these 1099s now appeared twice, falsely increasing my taxable income. I deleted the duplicates. Still don't understand the purpose of asking why I "used" these already entered 1099s, or what was meant by "used." Is this a software glitch? Thanks for any insight.