+1 to Jorma's reply and my money next to his
I've seen this happen a few times where new users did not realize that as a Host their changes affect the entire room. It is quite probable that they got curious about all the options and did some seemingly harmless fiddling with the layout/pods. While the product is not bug-free, but in many years I haven't heard of random permission changes and layout changes happening in a meeting room.
If you notice it happening again, please do update this thread.
regards,
Ashish