Not all instances/clients show those display names. I’m on kbin.earth and it doesn’t, I just see the underlying account name. It sounds like you’re seeing the same. But if I go look at Wheelchar’s profile on lemmy.world, which is their instance, it shows both “WheelchairArtist” and “@WheelcharArtist”
You fool, you’re only supposed to post things like that on the Warthunder forums!