Working with name ranges is not fully implemented yet, e.g. referring to a specific colomn of the named range and / or formatted table is not supported. Named range or table application area will be reduced or enlarged according to deletion or addition of specific rows applied.
If you add a row below the formatted table it won't be included to the named range. You will identify this because of the absence of any row style added.
If there is no answer to your question still, please send us back the screenshot and the .xlsx file you are talking about.