I don’t know what your setup is there really. But that QR event must be spawning the cube into the wrong level. I don’t understand how you have more than one level open unless you’re using streaming, but…
If you want the spawn to happen in the correct level, you’ll need to pass and even to there to make it happen in that area.
Any easy way is to make a cube spawner BP that only spawns when you call a custom event ( in it ). Just make sure you have one in the level and call that from your QR event instead of spawning directly.
Like I say, don’t really understand your setup, so I’m kinda working in the dark here…