Investors & landlords

There is no known issue with TurboTax not saving the Rental Expenses you enter. 

Be sure you have set up your rental property in the Property Profile section, and in the Depreciation sections under the Rental Property topic.

You may want to go through these screens again in regards to Ownership%, Active Participation, etc.

Click this link for more info on Reporting Rental Income/Expenses. 

Depending on whether you are using TurboTax Online or TurboTax Windows, here's some screenshots.