Board Thread:Support Requests - Getting Technical/@comment-14779707-20131118155029/@comment-1330470-20131118165634

I notice that the wordmark is 156 pixels wide. Help:Monobook indicates that the maximum size is 150x155. Consider a tiny resize to fit.

Alternatively, could be caching issues. I believe there's two caches: your browser's and Wikia's. Try waiting a few hours at least for it to update.