The QBI deduction is based on your net rental income, so as rental income decreased the deduction would decrease. However, I thought you said you had rental losses, so in that case your QBI deduction would be zero for the current year.
It is possible that you are subject to an alternative minimum tax which could affect things in strange ways.
What I suggest is you look at your tax return before the changes and then after to see what is being affected. That would allow for us to narrow down the possibilities. You can view your form 1040 and schedule 1 to 3 while working on your program in TurboTax as follows:
1. Find the "Tax Tools" option on your left menu bar and click on it
2. Click on "Tools"
3. Click on "View Tax Summary"
4. On your left menu bar find the "Preview my 1040" option and click on it
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