Vive screen only shows one eye stretched

When I try playing the VR example project, it tracks the Vive headset and controllers fine, but the headset itself shows the left eye stretched across both eyes (Screen Capture). I’ve tried “stereo on”, “vr.bEnableStereo 1”, “r.SetRes” with various resolutions, and “r.ScreenPercentage” with various percentages, in both PIE and standalone, and using both the in-game console and level blueprint. From my googling I seem to be the first person to ask about this, so perhaps it has to do with the fact I’m using Linux?