In dreamland in silverspring, you have a short amount of time to loot the enemies.
When this time frame is over, you are teleported to the spawn point where your mouse is underneath the exit portal.
When you wanted to loot an enemy, then you immediately exit without any confirmation.
Once exited, you cannot enter again.
I see multiiple possibilities:
1 ) move portal or spawnpoint, so you won't exit on accident
2 ) ask if you want to leave
3 ) remove the teleport and add a timer to spawn the next wave