Share Content Shows 4 Images

When sharing content via the HDMI input in our Zoom Room today, the content appeared fine in the room, but displayed 4 times in the top 25% of the screen with another row of distorted video in the 2nd 25%. Changing views or PC's connected to the HDMI port did not affect the problem. Stop sharing, retried, the error remained. Tried sharing from another participant, no problem, the error only occurs with the room. Room left the call, came back, shared content perfectly. I understand the issue is now gone and looks fine, but the room owner wants to know why the issue happened and how to prevent it.