A 50AMP Trailer is provided two 50AMP ZONES with it own circuit breakers to use. The RED and BLACK wires come from each of the two available 50AMP zones from the pedestal.
Don't get confused by seeing a full size 120VAC circuit breaker being substituted by two half size 120VAC breakers. These are both valid circuit breakers - just different physical size width size. The WFCO 50AMP circuit breaker panel is provide with 8 full size holes for circuit breakers to be installed. IT is normal to have two half size circuit breakers installed side by side in a full size circuit breaker hole.
i.e in my 30AMP WFCO 120VAC circuit breaker panel I have five lfull size holes for circuit breaker. I use one full MAIN circuit breaker for the MAIN 30AMP rated circuit breaker. This leaves my four remain full size hole to mount additional lower rated circuit breaker which can be filled with four full size circuit breaker or eight half size breakers. In my case i am using the half size circuit breakers so I have control to a total of nine separate circuit breakers in the 30AMP panel.
This allows you to have more circuit breakers in your system. Each of the half size circuit breakers will perform independently...
I really don't see anything odd about your dual zone 50AMP circuit breaker layout. Like said above if you want to re-distribute which zone is being used for certain appliances just move the HOT wire to the 50AMP zone you want it to use.
Hope all of this makes sense haha...
This WFCO panel ID shows what I am saying...
This layout appears to be using three full size circuit breakers and eight half size circuit breakers with one empty full size circuit br3eaker hole for future use.

Roy Ken