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No, they are not necessarily supposed to match.     Look at the QBI Component form from your return.    It shows how the QBI was calculated for your business.  

With the QBI deduction, most self-employed taxpayers and small business owners can exclude up to 20% of their qualified business income from federal income tax (but not self-employment tax) whether they itemize or not.

The deduction amount depends on the taxpayer's total taxable income, which includes wages, interest, capital gains (etc.) in addition to income generated by the business. Once the taxable income reaches or exceeds $163,300 ($326,600 if filing jointly), the type of business also comes into play.

At incomes below that level, the deduction is 20% of either taxable income (minus capital gains and dividends) or the QBI, whichever is less.

At higher income levels, the deduction is reduced or eliminated, depending on the nature of the business. The calculations also get quite complicated, but TurboTax easily handles them and will figure out how much of a deduction you’re entitled to.