Swap in stun - please check!

Bug Description: Swap in Stun - please check!

Area is was found in: PvP Arena & tournaments

How do you reproduce the bug:
Step 1- use a swap in stun (phorusaura in the arena, pachycephalosaurus in the current tournament)
Step 2 - The success rate of swap-in-stun seems to be clearly less than 66%.

How often does it happen: Having played at least a reasonable amount of arena matches and tournament matches in the past couple of weeks, the swap-in-stun success rate has been extremely low. More like 33% than 66%. Swap in stunning strike seems to be working as it should, but swap-in-stun is totally different. I don’t have any statistics collected about this, but please check that everything is as it should be. I might be having extremely bad luck, but the pattern is too frequent and has been so for the past couple of weeks. It seems to be the case both using swap-in-stun and being on the receiving end of it.

What type of device are you using: iPhone 6S plus