Because you are using a Download/CD version, you can to go to Forms mode (icon top right in blue bar) and find the K-1 Partner form with an issue. Click on that K-1 Partner form in the Forms in my Return pane, and the form will open in the window.
Scroll down until you find Section D1 and D2 of that K-1 Partner. Check the entries in Section D1 compared to the box 20 code Z Statement or STMT you received with the K-1. Follow the QBI calculation from Section D1 to Section D2. Section D2 will show the adjustments to the partnership income to arrive at allowable QBI. From here, the QBI flows to (in the left column) the linked QBI Component for that K-1, and the QBI Ded Summary. This may diagnose what is "happening" in your QBI deduction calculation.
Look for a box with red shading, which is an indication of an error.
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