When you are using the Abandoned Cart Recovery plugin by Addify, FacetWP will detect the wrong query for your post/product listings, causing the facets to not appear.

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

How to use custom PHP code?
PHP code can be added to your (child) theme's functions.php file. Alternatively, you can use the Custom Hooks add-on, or a code snippets plugin. More info
add_filter( 'facetwp_is_main_query', function( $is_main_query, $query ) {
  if ( 'addify_acr_carts' == $query->get( 'post_type' ) ) {
    $is_main_query = false;
  }
  return $is_main_query;
}, 10, 2 );

See also