Yes, the distribution should be taxable, unless a different taxable amount is shown in Box 2a. If your dad's IRA was funded by after-tax money, it's possible it may not be taxable (or not fully taxable), which the Box 2a amount or an amount in Box 5 could indicate.
What are the Codes in Box 7 on your 1099-R?
You could delete/re-enter the 1099-R, paying close attention to the follow-up questions, until you reach the end of that section.
Here's more info for an Inherited IRA and Inherited Retirement Plan.
Sorry for your loss.
@Lisa092
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