I overpaid my taxes yet turbo tax is printing form 2210 and checking box A in Part II? don't understand why box a is being checked.

It is an issue that is in the process of being resolved. Anticipated correction date is 2/22/19.

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Thank you for your patience. 

https://ttlc.intuit.com/questions/4621180-form-2210-required-but-no-penalty-is-applied