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Hello @nfavret , welcome to the King Community!
First
If on a mobile device try with force closing the app and restarting the device and see if it gets updated and your F-5 feature is ok.
If that doesn't resolve the issue
Please do the standard trouble shooting by log out, update your game application, restart your device and login, if playing through browser please clear cache/ history. And login again.
Thank you and I hope this will resolve your F-5 issue
Let us know your results please
Kind regards