I'm guessing by your post history that you're in Washington state (USA) and not Western Australia?
3 stalls per cabinet appears to be the standard for many regions which have only started receiving V3 in the last six months. All sites in Australia are like this (either 1 cabinet/3 stall or 2 cabinet/6 stall). A lot of the newer ones in China are 3 stall per cabinet (with higher numbers of stalls such as 15 or 21 - but always multiples of 3).