Deducting meals
(whether 50% or 100%) as a business expense does not affect your overall
balance due or refund amount dollar-for-dollar. Tax credits can do that, but deductions do
not.
Claiming meal expenses reduces the overall business income
shown on Schedule C. Then, with a
smaller income amount for the business, you will reduce your taxable income and
also reduce your self-employment tax.
The changes you are seeing in the screenshots you provided
are a result of reducing your business income, self-employment tax, and your
income tax.
