If you deploy a troop and next really fast, you can do this glitch. In other words, next after you deployed a troop.
You then have a replay that shows you deploying the troop, then it sends you back with the message "Something went wrong while showing the replay".
http://i.imgur.com/jhlQB1r.jpg
I just found this particularly amusing when i accidentally did it. After you drop the troop and next, you still keep that troop for the attack if you wish to do so. But if you drop and next again, you will lose the troop you dropped for the first drop and next.

