В контроллере добавьте условие
catalog/controller/product/category.php
Оберните
$data['description'] = html_entity_decode($category_info['description'], ENT_QUOTES, 'UTF-8');
таким образом
if ($page == 1) {
$data['description'] = html_entity_decode($category_info['description'], ENT_QUOTES, 'UTF-8');
} else {
$data['description'] = '';
}
Тоже самое сделайте и с производителями
if ($page == 1) {
$data['description'] = html_entity_decode($manufacturer_info['description'], ENT_QUOTES, 'UTF-8');
} else {
$data['description'] = '';
}