The number 1 problem here if I remember correctly is that you have a male and female ends on the rear couplers at the tractor end.
THAT IS WRONG AND NOT INDUSTRY STANDARD. The female ends are suppose to be mounted on the tractor and the male ends are on the hoses. Mark them with colored zip ties or colored tape. Look at you loader hoses, they are marked with colored tape to keep the fluid direction as it should be after coupling-uncoupling.
This is such an easy fix it is sad that this has gone on for so long.
Your dealer is an idiot.
Put all female couplers on the tractor and all the male ends on the hoses. Then it is easy to simply switch the hoses around if you desire.
My recommendation is to change the couplers so that they are set up in a std industry way. Get the direction of the cylinders so that they go down when the control levers are pushed forward. Mark the hoses and couplers with colored zip ties or colored electrical tape.
As well as I agree that the dealer should take care of this, he is obviously an idiot and I would not let them touch my tractor. Fix it yourself, it may take all of an hour at most.
Get it right and go do some work-move on.