We now have three different threads in the past week that report Google has the wrong site in its cache for a query. We have seen this before, where we said Google Slow to Update Cache Data?
In that case, a cache command for a site was showing a different site in the Google cache.
Why would that happen? Could be how Google is handling redirects, could be just a out of sync cache showing old data, could be a virtual host issue where Google is confused which site is propagating for the IP address or could be something else.
The three recent reports come from this WebmasterWorld thread and also this WebmasterWorld thread, which we covered here and a HighRankings Forums thread. Plus we have an older report at Google Groups.
We see these reports prop up here and there but typically not at this volume. So maybe something is going on, on a wider scale at Google?