That should be very incorrect. That would require a 1-phase panel being supplied by the B phase and only one of the others.
Going down either side, you should see A, B, C, A, B, C, etc. A breaker at the C-A position should have both legs at 120v to the neutral.
Make sure this panel is a 3-phase panel, that it has three main terminals or a 3-pole main breaker. Also, are there any 3-pole breakers installed?
Take me out and beat me with a stick. Larry was right A, B, C, A, B, C etc. The 2 pole breaker is on A & C ,and everything is working fine.
THANKS ALL !