Problem with Real Estate Taxes

Hoping someone can help.

 

I entered real estate taxes for my home in the Home Office section (total $8000).  In the home office section, it allocates part of that to the home office (e.g. $600 of the $8000).  When I then move on to the personal income section and look at property tax deduction, it shows -$600 (negative $600).  Where is the rest (e.g the $7400)?  It does not show up in the real estate taxes paid in the personal section.

 

Also, how do I know if these real estate taxes are "excess" or not when I'm entering the home office part as it comes before the personal section.