There are a small enough number of observations for this species that I was able to check every one: I haven’t added an ID, maverick or otherwise, to any observation of Crepidotus variabilis. So that’s not it.
This is kind of ridiculous. I put a lot of general-category IDs on observations with no IDs. Am I therefore on the leaderboards for a bunch of plants and fungi species, none of which I know how to identify?
As a concrete suggestion for a partial bugfix, I suggest changing the TOP IDENTIFIER and “Leaderboard” link on taxon pages to go to a list of people who have identified an observation as being in that taxon, not a list of people who have added any identification at all to an observation community identified as being in that taxon. In other words, don’t link it to the identifiers view of an explore observations search, link it to the actual top identifiers.