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After further research, a resource was found that verifies the way TurboTax is handling the depreciation for the foreign rental property on the California return.
When the Federal tax law changed in 2017 due to the Tax Cuts and Jobs Act to shorten the recovery period for foreign rental properties from 40 years to 30 years, California state law did not conform to this change. They opted to keep the longer recovery period and then report the difference between the Federal depreciation and the California allowed depreciation as an adjustment on the California return. So, therefore, TurboTax calculates it both ways for the California return and includes the difference as an adjustment.
For your reference, here is a link to the document that states the Federal change in recovery period (see page 158 or the screenshot below) and then later the fact that California does not conform to the change (see page 159 or the screenshot below): Summary of Federal Income Tax Changes 2017
