What you were expecting to happen, and what actually happened:
I was expecting PvP League to lump me together with a wide variety of players. This week, all 29 other players are in the level range 1004 - 1014. Which feels pretty unintended, considering that I’m level 1827.
This was possibly fixed before Christmas when there were general fixes to the way the buckets for PVP were populated, let me know if you are noticing these small level windows still now.