So I was going up hill in my new to me 2010 Charger and the vents like is well documented as crazy vents over in the second gen section switched from blowing out the dash to blowing out the defroster vents.Tried a search could not find answer as to why or how to fix on the charger.

 

Your 2010 Charger has no vacuum in the HVAC, it's all electronic.

 

Yep, perhaps your blend door is broken and moved during the incline due to inertia and gravity.