Normally the sync is chosen like I explained in this post.

However, since yesterday the sync in this room is constantly the player with the longest cumulative connection time instead of the blue shaman.
Summoning a totem can totally break the game: Every item which is anchored to something after the totem was spawned gets anchored to another item, you cannot build reliably at all anymore.
It only saw this happening in room vanilla1 on the DE server.

I'll try to keep gathering more information about this.

Edit: It's not constantly happening and apparently it's not the player with the longest cumulative connection time but always one of the DE mods who are sync when it's happening.