How to read correct BuiltInParameter values from a list of FamilyParameter

I'm trying to read BuiltInParameter, Parameter Name, Parameter Type etc from a list of FamilyParameter instance. The code I'm using to read the FamilyParameter is written here on the GitHub. The output of the code is here.  As you can see, there are a lot of INVALID values in BuiltInParameter Column.  But when I cross check the value of BuiltInParameter it is not INVALID. 

I'm wondering if someone could explain, how could I get the valid BuiltInParameter data from the list FamilyParameter. Appreciate any help. Thank you.

~ Ali