You mentioned you are using the 2019 TurboTax Business software. That software is only for corporations and multiple member LLCs and is only for use in preparing 2019 returns. You have to use a 2020 product to complete a 2020 return - and you need Home & Business for a sole proprietorship. The 2019 software will correctly calculate your QBI deduction, but the 2020 software is not yet up to date for the QBI deduction as the forms have not been all finalized yet.
Using the 2019 Form 8995, your QBI is found on Line 15, which is the lesser amount of line 10 or 14. The deduction is limited to the amount of Line 11 (less capital gains), so if Line 11 is a low number, your QBI deduction will be low as it is 20% of that number. You are describing a situation where your taxable income is lower than your qualified business income.
The deduction is 20% of either taxable income (minus capital gains and dividends) or the QBI, whichever is less. @TaxUser134
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