What gameplay feature is this bug affecting?
Trading

What's the issue? Please include any error messages you receive and as much detail as possible.
Hi, I put my lion up for trade a while ago, and I thought I'd check on the trade. When I clicked on the link from the lions page, it said that the trade no longer exists. I tried to get into the trade from 'Manage Trades' in the trading centre, and it says it doesn't exist there either. However, on my lions page, it still says that it's up for trade. Thank you!

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
https://www.lioden.com/lion.php?id=794170455237

Any screenshots you can provide us with?
(using computer, so screenshots aren't possible for now)

Please provide us with step by step explanation how this bug happened so we can attempt to replicate it. If it's complex, please include screenshots where possible:
The trade was fine, until I checked on it recently.