Your web browser's cache stores certain information about webpages you visit, so that they'll load more quickly in the future. Whilst this is usually a good thing, sometimes out of date information and even your previous location can get cached and this can cause problems.
If you need to clear your browser cache, please see the relevant link below which will guide you through the process with full instructions and screenshots on how to clear the cache for all major web browsers:
Safari 5.x (OSX Lion)
Safari 6 & 7 (OSX Mavericks)