When you are using the Woocommerce Product Recommendations, FacetWP’s query detection will cause problems with the query for the recommended products on your cart page.

Add the following code to your (child) theme’s functions.php to fix this issue:

add_filter( 'facetwp_is_main_query', function( $is_main_query, $query ) {
  if ( function_exists( 'is_cart' ) && is_cart() ) {
    $is_main_query = false;
  }
  return $is_main_query;
}, 8, 2 );

See also