This is an ongoing two year old problem with no solution in sight, at least until V3 is fully released. There have been a lot of complaints:
http://www.chess.com/forum/search?keyword=my+games+in+explorer
Game Explorer
Sort:
Most Recent
Forum Legend
Following
New Comments
Locked Topic
Pinned Topic
Why is it that not all of my games are shown on game explorer? Does it only update date them every now and again?