Your stats page is generated at the date listed from the information available in the database at that time. When caches are logged it takes some time for Project-GC to read the new logs into the database. Expect 24-36 hours. Thus, your new log probably wasn't discovered when your last stats were created. The log will probably be included in the next update.
If you really want an update now, you can click Support -> Self-support and then the appropriate update button.