Change in QBI when entering SSN

Why would the Qualified Business Income and associated 20% deduction be reduced when I simply added my social security number to the personal info section when prepping my taxes? I typically add my SSN at the end, prior to filing. I noted that adding my SSN changed the QBI amount that I entered from my 1099-MISC to a lower amount (~$2,000 lower), which in turn lowered the 20% QBI deduction. Why would this occur when using Turbotax?