I entered what you described in TurboTax and I don't see the income being taxable. It is possible the income is affecting a credit as they can be sensitive to income, even if not taxable.
I suggest you look at your form 1040 before and after the entry to see what is changing and research further once you narrow it down to what is being affected.
You can view your form 1040 while working in the online version of TurboTax by following these steps:
While working on your return in the Federal section of TurboTax:
1. Choose the Tax Tools icon on your left menu bar
2. Tools
3. View Tax Summary
4. Choose the Preview my 1040 on your left menu bar
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