Hello!

As far as I know, before you can proceed for using or spending Cave Keys, a warning will pop-up, thus going through the process should be known to you as you ticked the box and confirmed it. But if you feel like you've experienced a Bug or something, please visit our Bugs and Support Section or file a ticket at Customer Support. Explain your problem and provide all possible information needed for your issue to be resolved faster.

If you have Cave Keys:

If you don't have Cave Keys: