When rescheduling events to another session using the “Tweak Track Schedule (overview)” tool, it seems that it assigns the event to the new session, but it doesn’t remove it from the old session (or indirect reference to that session).
This causes the publicly facing website to view the schedule correctly, as it is designed using the tool. However the manage sessions page also shows the moved event in the old session, and tries to fix the schedule to fit in the event to the old session again.

Submitted by Elmer van Chastelet on 12 September 2018 at 07:35