Why doesn’t fuzzywuzzy’s process.extractBests give a 100% score when the tested string 100% contains the query string?

I’m testing fuzzywuzzy‘s process.extractBests() as follows:

Why doesn’t fuzzywuzzy’s process.extractBests give a 100 score when the tested string 100% contains the query string?

I’m testing fuzzywuzzy‘s process.extractBests as follows: