Right before the updates of today I was trying out some hydra teams.

Since the update was almost coming up, I got out of the fight so I could try it later again.

After the update I found out my last key is missing. It didn't record any damage though.

In Hydra clash it clearly says I only put in 2 hydra keys:

i

But I've lost 3 keys:

i

My nightmare and brutal hydra were done yesterday already and this morning I still had one key, so I definitely didn't use anything up before hydra clash started.

The most annoying this is that I'm already 1.11 bil into the 1.2 bil for the accessories chest, so losing that 3rd key is going to cost me rewards next week.