Mediawiki, the software behind Wikipedia and Rosetta Code, has a cache mechanism. According to its manual:
The file cache serves anonymous users only and they see the same HTML rendered. Logged-in users don’t benefit from this cache because their page contains user name, selected skin, etc.
Probably, in this case, the result of the script which is called by the page has been cached for anonymous users, and it is older than the latest page generation, which can be seen by the logged-in users. With the necessary time, we can assume the cache will be invalidated and the page refreshed for all users.