You'll need to look at certain forms in your return, related to your Schedule E, to diagnose "what happened" in your QBI deduction calculation.
If you are using a Download/CD version of TurboTax, you can look at these forms in Forms mode (icon at top right in blue bar). Look in the left column to find the form, and when you click on it the form will open up in the window.
If you are using TurboTax Online, you'll need to "print or preview" a PDF of your tax returns with the worksheets to perform this analysis.
Find your Schedule E Wks and scroll down just past line 22 to find the Qualified Business Income Deduction Smart Worksheet.
Check question A to ensure your Schedule E is linked to the correct QBI Component worksheet. Then, check the information for questions E through J to follow "what happened" in your QBI deduction calculation.
Next, take a look at the QBI Component worksheet for that Schedule E. This worksheet will provide additional information about the QBI calculation.
Finally, take a look at the QBI Ded Summary and the Form 8995 or 8995-A for the "final" details of the QBI deduction calculation in your tax return.
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