There should be a line near to the end of
define( 'WP_CACHE_KEY_SALT', 'namidia.net.br:' );
Move this line to the beginning of file, in order to be above the “stop editing” comment.
What happens is WP and REDIS lose sync because WP never interprets such
define if it is wrongly positioned inside the configuration file (that’s why moving it more to top of file usually fixes this behavior).