I think I mentioned this somewhere else, but the 5 slots on Arcade tend to be:

• Event 1 (currently Château FFA Deathmatch, was Lucioball)
• Event 2 (currently Team Deathmatch, was Copa Lucioball)
  • Replaced by 1v1 Limited Duel (formerly 1v1 Mystery Duel) when only 1 Event is running.
• 3v3 Lockout Elimination (replaced 3v3 Elimination in May)
• Mystery Heroes
• Rotates weekly between Capture the Flag, No Limits, and Total Mayhem (and possibly Low Gravity)

The problem is that the rotating square was switched to Total Mayhem at the start of the Summer Games and has stayed there ever since.

While this wouldn't be the first time the random square stopped rotating during an event, why has it not changed now that the event has ended?

Edit: Note that Event 1 includes updated and new game modes such as Deathmatch, 6v6 Limited Elimination, etc...