Via the Steam Store:

We’ve recently had some bugs with the Cavern Crawl not counting wins correctly. There are two classes of bugs that have caused this. The first is a more general rare case that has happened intermittently where the Cavern Crawl didn’t update its progress based on wins. This scenario has been fixed for some users and will take a few days to go through all affected cases. The second class of bugs happened yesterday for a few hours where the client was displaying incorrect information as to which heroes should be played. Users affected by that have been given Cavern Crawl Keys and additional Battle Points.

• All heroes suggested for banning in Mutation are now banned.
• Fixed a bug that would cause super blink dagger to not show up in its mutation.