Fuzzy match score generated greater than 100 .And match score generated

Hi Team,

I am trying to do "Company Name match" using Fuzzy match with custom style. The Key generation is based on word and Key generation style is "Double Metaphone" using best of Jaro and
I am getting less than 100 for the self match records , For example in the attached sheet, "King & Spalding" on row 7 is a self match Key = 7 and ID2 = 7, but the score is 87.
Attached the workflow , input and output sheets.

To solve this issue I had pulled out such records(records having < 100 score for the self matches) into a separate sheet and tested out using same set of values as the original workflow,
but this time the results are surprising to see the match score > 100 (=114). Why a match score needs to be greater than 100?

is this a bug in Fuzzy match or am I missing something?. Also for a self match (records having same Key and ID's) I am expecting the match score to be 100
and not 87. KIndly let me know at the earliest.

Thanks,
Raghavendra B