Unfortunately, TurboTax may not see this as an error, since the total Property Tax in Itemized Deductions can come from several properties that are unrelated to your main home or home office.
It is best to enter Mortgage Interest and Property Tax in the Home Office section first.
Let TurboTax calculate the % of Home Office, and take that % of those costs. The balance 'should' go automatically to Schedule A, Itemized Deductions.
However, with some of the new regulations on Property Tax and Mortgage Interest for 2018, this may not always function as perfectly as it should.
It is good that you noticed the error, and in FORMS mode, can make the corrections needed. Or, you could delete the entry in the Personal section and go through the Home Office section again.
Here's more info:
https://ttlc.intuit.com/replies/7138197
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