It appears you are either entering a wrong date for the date placed in service or you have selected the wrong type of property. The 31.5 year recovery period was for nonresidential or commercial real property (buildings and structural components) was used only until May 13, 1993.
For the recovery period of 27.5 years, you are selecting residential rental as the type of asset. Both use SLMM as the convention for calculating depreciation. Once you make the correct selection for the type of property you will have the right life of the asset.
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