It is very common. Please read this post from user xmasbaby0 for the explanation: Charitable deductions. You may also read this: Donations
Here are the 2019 standard deductions:
Single taxpayers and married taxpayers who file separate returns can claim a $12,200 standard deduction.
Married couples filing jointly can claim an amount that's twice as large, $24,400, and
Taxpayers filing as "head of household" (single individuals with dependents) can claim a standard deduction of $18,350.
@benkue
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