In general, TurboTax is making an adjustment on line E-2 for some component of your rental income that is not qualified for QBI. Because your adjustment increases the rental income amount for QBI, one of the deductions used to calculate the rental income amount in E-1 (e.g., W-2 wages or a capital loss) is not eligible for QBI and is being "added back" here on line E-2..
If you right click on the E-2 amount and choose "Data Source" you may get a specific reference to the source of the form in the pop-up window, or you may get a text explanation that starts with:
"Enter adjustments for items of business income/expense that are subject to passive/at-risk limits but not qualified business income items under Section 199A."
If you right-click the E-2 amount and choose "About Adjustments to QBI" you get an explanation and an example for E-2 adjustments, including this:
"If specific items of income or deduction from this business need to be excluded from qualified business income, the net adjustment may be entered on lines E2, F2, or G2, as applicable. The starting value for ordinary gain/(loss) and Section 1231 gain/(loss) comes from the tables above lines F1 and G1. If the ordinary or 1231 component of any of these asset sales is incorrect for purposes of the QBI deduction, the value may be changed."
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