On the Tax and Interest Deduction worksheet, line 2a is "real estate taxes paid on principal residence not entered on form 1098". Line 2e is "[by implication: state and local real estate taxes on a] vacation home".
You would think that by definition, a vacation home is not your principal residence. So did you enter this tax amount twice into TurboTax in two different places?
Is it possible that you are trying to enter this in Forms mode? You should really try to avoid using Forms mode, if there is a way to make the entries through the Step-by-Step mode.
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