My left pair of L3s / L3t both show number 1, and my right pair both show number 2 (when they are wired in that order). My L2 monitors are then numbered from 3 and upwards.
If I wire in a different order (put the L2 monitors between the left and right stack), the two speakers in the left stack still get number 1, but the speakers in the right stack get different numbers (usually 2 and 3). But everything works fine, and I have got the habit to connect the speakers in this same specific sequence each time, to be sure I have some sort of control. I don't know if this is the way it is meant to be, though...