To explain, I think what’s happening in this case is that rather than clicking copy link on their Rooms page and sharing that link, some tutors are copying the link straight out of the Chrome address bar when it contains a parameter setting their email address.
That is, they’re sharing links that look like this: domain.bramble.io/RoomNamefirstname.lastname@example.org
When another user clicks on that link, the URL parameter for email skips the welcome screen and connects them to the session with the email email@example.com
The link the tutor should be sharing looks like: domain.bramble.io/RoomName
It’s fairly easily fixed though, anyone joining the session with the wrong email just needs to click 'change email' on the welcome screen. This will avoid recordings being sent to the wrong email going forward.