Interesting question. I am sorry for the delayed response.
In Compass, we show schema for maximum 1000 documents which are chosen randomly. The % in the bracket describes the % composition from total documents given for anaylze.
So, maximum documents that can be taken in sample is 1000 documents i.e.
( 1000/71085 ) * 100 =
But when you filter documents and you have total 99 documents which is less than 1000, so the Schema takes all the documents to analyze. Thats why it shows 100% i.e
(99/99) * 100 = 100%.