Hi,
This isn't really a bug, it's just a suggestion.
In "Your Collection", if you order by set, the sets come ordered alphabetically, while in "Manage Collection" they come ordered chronologically (kind of).
Personally, I find the chronological order much more meaningful (and more useful) and I'd like to have it in both views.
Also, some minor expansions (like for instance: Friday Night Magic, Player Rewards, Arena Leage etc.) are missing.