It could be related to QBI as you mentioned. However, in this case, when your income increases, the QBI credit could increase, and your tax liability could actually go down. Since we can't see your return in this forum, try this check to try to determine what's causing the increase/decrease.
Per Expert @VanessaA:
"Generally when your refund drops after you enter expenses it is because you were getting some type of tax credit where your income was at the perfect level, then when you entered the expense so your income dropped causing you to qualify for a smaller credit or no credit.
To figure out why this happened in your situation, look at your 1040 with the expenses added and write them down or print it out. Then go back and remove the expenses, look at your 1040 with the expenses removed, then compare the two. This will tell you where the change is coming from.
To do this click the following after logging back into your return if you are using TurboTax Online:
- Tax Tools
- Tools
- View Tax Summary
- Preview My 1040"
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