This is always the case with doodads. It's because Doodads aren't usually selectable, meaning a portrait.mdx was never created for them. Unless you make a nameofdoodad_portrait.mdx for it, it'll never display its portrait the way you want it.
I -think- it's possible by using the mdx from the doodad and saving it as a portrait version.. but I'm not sure how you'd set the Camera then. Ask someone with more experience, I'm just guessing from here.