I try to list posts in multiple categories. Everything goes fine in the admin panel. I go into all posts, i select desired posts, after that i go into edit and select one category. After i save the changes, under categories tab is written the old category and the new one. Now when i visit website and i select updated category there is only the old posts and not new ones .
For example: I have categories: movies , games , best and posts: best movie , best games , best And i need like that: best movies goes in movie category best games goes in games category and both goes in best category
I use date and post name as permalinks.