[Dewo]

Notice the yellow sentence, which appears to be the sentence, that reveals the drop of the box.

[Santa]

It's probably just a very rare bug that's not fixable.  Basically the game has already started without you.  Maybe your internet died for 1-2 seconds then came back, at the exact moment the room master pressed start.  Either way, I've actually never seen this happen so I do not think it will affect anyone at all, just once-in-a-life-time-unknown-events.

~RedEyes.

[Dewo]

It's probably just a very rare bug that's not fixable.  Basically the game has already started without you.  Maybe your internet died for 1-2 seconds then came back, at the exact moment the room master pressed start.  Either way, I've actually never seen this happen so I do not think it will affect anyone at all, just once-in-a-life-time-unknown-events.

~RedEyes.

I think, it's pretty much it. 
Btw, check ur pm from me!