Exterior wall materials displaying on interior surfaces

Had this problem before and thought it was aligning upper/lower floors/walls, but I'm stuck.
Selected exterior 4" wall with siding and interior is drywall....keeps displaying as siding on BOTH sides. Ortho /camera views are displaying siding on interior.

Open the Wall Specification Dialog - Materials Tab and check to see if the unwanted siding is assigned there, overriding the default material setting of the wall. My best guess based on no plan file or images to view from you.

DJP