The first number is pagerank and the second is localrank, or perhaps its the overall rank after factoring in localrank.
As this is an adult search, the numbers may have something to do with safesearch...level of offensiveness, perhaps. ;)
The numbers have nothing to do with pagerank, but are more a "relevence factor" based on the query, or perhaps some sort of overall score. The first number is in descending order for the data we have, which PR almost never is. 2.71-3.35 is also quite low PR to be in the top 10, assuming this is a competitive term. I'm not sure what to say about the second number in this scenario