[Mirage/Betrayal] Arena in Mirage leads to the wrong part of map on Racecourse

Hello,
While playing on Racecourse I entered a Mirage next to a Boss Arena. However my character did not enter the Boss Arena but the Betrayal fortress part of the arena that I completed earlier. On Racecourse the fortress spawn on its own, away from everything else and the Mirage tp me on this part rather than the boss arena.