While modeling in Revit, it is important to be mindful of the orientation (Interior vs. Exterior) of curtain walls, walls, and/or windows. Having the correct orientation ensures proper analysis of the model. The exterior of these elements is marked in Revit by a double blue arrow.
You can spot check your model's curtain walls and walls orientation by checking the collection image in the Web App. The first image clearly shows that both the East (green) and South (brown) walls are facing the wrong direction and need to be corrected to match the image on the left.