Проблемы с кодировкой могут стать настоящей головной болью. Но вместо правки ваших записей вручную можно воспользоваться запросом, который очистит вашу базу данных от непонятных символов:
UPDATE wp_posts SET post_content = REPLACE(post_content, '“', '“');
UPDATE wp_posts SET post_content = REPLACE(post_content, 'â€?', '”');
UPDATE wp_posts SET post_content = REPLACE(post_content, '’', '’');
UPDATE wp_posts SET post_content = REPLACE(post_content, '‘', '‘');
UPDATE wp_posts SET post_content = REPLACE(post_content, '—', '–');
UPDATE wp_posts SET post_content = REPLACE(post_content, '–', '—');
UPDATE wp_posts SET post_content = REPLACE(post_content, '•', '-');
UPDATE wp_posts SET post_content = REPLACE(post_content, '…', '…');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '“', '“');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, 'â€?', '”');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '’', '’');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '‘', '‘');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '—', '–');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '–', '—');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '•', '-');
UPDATE wp_comments SET comment_content = REPLACE(comment_content, '…', '…');