Random People Joined our watch2gether room

I was in a watch2gether room with my friend, and then suddenly some people joined the room. We only shared the link in a private message. But 3 random people joined one was cynthia42@mailrez.com and unique61@mailrez.com and then a person named Representative.
Can someone pls explain what happened?

Thanks for your bug report. Did these user somehow interact with the room or did they just appear in the userlist? Through what kind of system did you guys share the link of the room?