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I would advise you not to use the user meta. Although your problem is caused by: update_post_meta( $author_id, "_user_followed", $followed_USERS ); // Add user ID to author meta update_post_meta( $author_id, "_author_follow_count", ++$author_follow_count ); note that you called update_post_meta not update_user_meta, so somewhere, there's a post whose ID ...

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