Weight Distriibution Brackets on Equalizer Hitch

I doubt that it changed the weight distribution settings. Moving the hitch head up or down just changes the attitude of the trailer. It would take quite a large movement of the hitch head to make any noticable change in the WD.

I suspect that, as has already been mentioned, you had more tension on the bars after the move when you tried to get them off the L brackets. The solution is to raise the rear of the truck with the trailer still attached and then remove the WD bars from the L brackets.
Barney