6
This is not a bug; it's part of an update to the review queues. You now get one Steward badge for every 1,000 reviews in a single queue. For more details, see Steward badge can now be awarded multiple times -- backfill details on Meta Stack Exchange.
3
Like @jonsca mentioned, we still haven't cross April of this year - hence the year won't be shown till it's past that date.
1
There already exists such a badge called yearling
Active member for a year, earning at least 200 reputation. This badge can be awarded multiple times.
Only top voted, non community-wiki answers of a minimum length are eligible