Hi Andrew, this is Dave Pinch from the Guides team. You should not be seeing that behaviour and I would like to help diagnose it.
First, can you first confirm that you (or your clients) are running the latest version of Guides?
Next, are you seeing the incorrect orientation on both the HoloLens and PC apps?
Download alight motion here. https://getalightmotion.com/
Finally, I am wondering if you are able to share a copy of a small video that shows the behaviour (or asks permission from a client)? If so, please use Feedback Hub as described below. There is a step in the feedback process that will allow you to add an attachment.
community.dynamics.com/.../how-to-submit-guides-repro-steps-telemetry-through-windows-feedback-hub
If that doesn't work, let me know I'll find a different way. When submitting feedback, make a note of the title or any ID is given to you and send it to me (reply or IM). That way I can find look it up and get it routed to us faster.
Also, if anyone else has experienced this issue, please let me know because more data points will help.