Why might a double-pole breaker have the same phase on each wire lug?
Your double-pole breaker is not switching both legs simultaneously as it should be.
The top D-F pole is connected, while the bottom E-G pole is not connected.  

Whatever 240V appliance you have connected to that circuit is feeding the  'B' phase from D-F back into your G terminal.
Even with no appliance connected, capacitive coupling between the wires in that cable will fool your mutimeter.  

If you had a load to neutral from both poles you would see 120V on one and 0V on the other.