High humidity causes high condensation.....
That condensation has to go somewhere. It should collect in drip tray under evap coil and then drain out thru drain holes in each end of drip tray...either out and down roof or thru drain tubes to under rig.
Dirty air filter, dirty evap coil, plugged drip tray drain holes/hoses or over-compressed roof gasket will cause condensation/draining issues....then condensate gets picked up by fan blower and blown inside.
Remove return air filter....inspect using flashlight-----evap coil, roof gasket, drip tray (feel with your hand how much water in tray.....should just be wet and not holding water)