How do I get an error in Turbo Tax business fixed?

I claimed section 179 deductions in 2019 on several pieces of equipment, but it was not allowed because of a loss. I sold the equipment in 2021 and Turbo Tax shows a zero tax basis for that equipment. and is trying to tax the full sale price as a gain.  I checked my 2019 and 2020 returns and there is no depreciation or section 179 expense.