I can confirm the issue. It’s probably related to the game’s own VR support that was introduced some time ago. It worked before that. VR mode can be enabled in the game’s graphics menu. Looks quite wrong though to me, not sure if they ever tried it with a Rift.
I will look into the issue once the the DK2 update is out. But since the game has a native VR mode now it’s not a priority.