It sounds like you're not getting proper flow through the right side of the duovalve. That will cause a heat problem next winter. But maybe she won't notice, if she's in the left seat.

It sounds like they're both shutting off the flow, but your refrigerant level is low causing the warm left-side vent.

I don't know about the flaps, sorry. The WOT error comes and goes for me too. No troubles as a result.