I'll add to your hypothetical so I can get the number you are driving at. Let's say that for your hypothetical your SE tax on the 200,000 is 20,000 (It's actually about 22,875, but 20,000 is a nice number). 1/2 of that is 10,000, so that takes your 200,000 Partnership income down to 150,000. You would think that your QBI would be 30,000, but it might not be. If your income is all from the partnership, then the QBI deduction is further reduced (the lower of 20% of QBI and 20% of taxable income). So if you are filing as single (which we'll revisit), you would have to deduct yet another 12,400 from your figure, bringing the calculation to 137600. 20% of that would be 27520. If you are filing as either Head of Household, Married Filing Joint, or are claiming Itemized Deductions, your QBI deduction would be even less.
But there's a further caveat. If your income is up at that range, and you are filing as single, you are in the QBI "phase-out" range, which is a very complicated formula. And if you are in that phase-out range, and your business is an SSTB, then the reduction is even greater. For more details on this whole situation, please see this Help Article: What is the Qualified Business Income (QBI) deduct..., and click on the embedded link in the article: How is the deduction calculated? (Not for the faint of heart!)
Point being, that while it is possible that the program might be calculating your QBI wrong, there is a real good chance that the calculations are correct and you are unaware of a few factors that could be lowering it, or entries that may need to be made to bring it back up. It can be complicated, but if you provide a little more detail, we may be able to come to a solution together.
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