It's not a bug... it's a feature!
(I think...)
1) If the player is active but has no major league stats for the most recent year, they're listed as inactive with their "end year" being the last year with big-league stats.
2) I seem to remember that, in the Black Ink / Grey Ink leaderboards, if a player hadn't led any category in the current year, something similiar happened... but poking around my Catobase web, I can't find any examples, so these may be the same as #1 and I just dreamed up this alternate explanation.
