Probably related to Direct VR positional tracking, something similar can happen when you sit down on a chair for example. Two potential solutions:
1. Disable the positional part of DirectVR on the DirectVR page of the vorpX menu, default G3D pos tracking will still be available. So if you play with G3D that’s probably the best option.
2. Alternatively you can temporarily disable DirectVR entirely with ALT-K before using a terminal. The shortcut can be changed in the config app.