It's not clear what you are looking at. Where exactly do you see $6,912? Post a screen shot if you can, but be sure to omit any personal information. This is a public web site.
As LindaH2 said, homeowners insurance for your personal home is not tax deductible, so that would not be included in any deduction. Mortgage interest and real estate tax are two separate deductions. They would not be added together, except in the total of all your itemized deductions.
As a guess, what you might be seeing is the deduction for state and local taxes. That would include your real estate tax plus either sales tax or any state and local income tax that you paid or that was deducted from your pay on your W-2. It would not include mortgage interest. The total deduction for state and local taxes is capped at $10,000 ($5,000 if you are married filing separately).
