It is possible that you are experiencing this issue because the XCache extension is not configured properly. XCache is a PHP opcode cache that can improve the performance of your PHP applications by caching compiled PHP code in shared memory. However, if it is not configured correctly, it can cause issues such as displaying the same data for multiple pages.
Here are a few steps you can try to resolve this issue:
Check the XCache configuration: Make sure that the XCache extension is properly configured in your PHP configuration file (usually php.ini). The extension should be enabled, and the cache size and other settings should be appropriate for your system.
Clear the XCache cache: If the XCache cache is full or contains outdated data, this could cause the issue you are experiencing. To clear the cache, you can use the xcache_clear_cache function in your PHP code, or you can use the xcache_clear command-line tool.
Check for other caching mechanisms: If you are using other caching mechanisms such as APC or memcached, make sure that they are properly configured and not conflicting with XCache.
Check for server-side issues: If the issue is not related to the XCache configuration, it is possible that there is a problem with the vBulletin software or the server. In this case, you may need to check the vBulletin logs or consult with the vBulletin support team for further assistance.