Really don’t think this is a conflict issue. But will check that of the list some time next week when i have more time to do it.
Other user with the same issue
https://theeventscalendar.com/support/forums/topic/wrong-organizer-from-facebook-imports/
Is it possible for you to import this event on another calendar site to check if HepTown is used as host?
https://www.facebook.com/events/243700452834664/