Rental Property Depreciation Partial Year. TurboTax Calculation double divides?

Bought house in May2014 for personal, then rental in July2017.

Total was $185K (land was $50K).

For date I started using rental, I put 7/1/2017.

Turbotax automatically calculates % time used for business as 50.14%.

Turbotax calculates my depreciation as $1,105.

According to my calculations it's closer to $2,210 = ($185,000 - $50,00) divided by 27.5 multiplied by (6 months - 0.5)/12))

It seems Turbotax is double inputting 7/1/2017 as half the year and then further dividing by 50.14%?

Please help.