I thought that only happens on my forum, but today I also see it happening here. Sometimes the public calendar island displays "Oct" instead of the full month name.
I believe this comes from what screen the user is on when the calendar cache is updated. There are some language files where the month name is abbreviated, and it's overwriting the full month name. Need to track that down
Yeah, it's a language trampling issue. The easiest fix is to edit the addpost.php language file and change all of the abbreviated months into full month names.