Apple has pushed out an update to iTunes for Mac and Windows that addresses issues users may have been having with iTunes in the Cloud. The bump to version 11.0.5 corrects an issue where iTunes in the Cloud would download or play unexpected items, and while it's not something we've seen ourselves, we're never going to turn away important fixes such as this.
The update is pushing out via the Mac App Store for OS X users, though if you've not seen it yet it's always worth manually checking via Software Update. Windows users should go ahead and manually check for updates too if they haven't already been notified, and the latest version is also available as a direct download from Apple.com. The important question though is; were you seeing the listed issues, and has this update fixed them?