When you selected him for the gems did you happen to notice if the window said someone else had taken his loot and was defending it?

I noticed that when I come across other people in the Arena who have had their loot taken by another person it gives you a false read on what the real prize is. I think it has something to do with beating the person you selected AND then beating the person who is defending the loot they captured from the first person you were fighting.

I have been trying to test it out but I can never make it to the defender.

But yeah this has happened to me with coins, exp and credits too, there was only one time where I got the full amount of exp and it wasn't being defended by someone other than the original person I attacked in the arena. The majority of the time I only get a percentage of the prize and I noticed it's usually because someone else is defending it.

Could it also be disappearing because the person who was defending it either logged in and clicked it to keep the loot since the timer might have been up or could the prize just have timed out?