I suspect you are using a third party addon called “Justified Image Grid”?
What your current code does is replace the image IDs that woocommerce uses to generate the gallery with IDs provided by an ACF field.
The “Justified Image Grid” field is a field that outputs different content. Even if you managed to get WooCommerce to use the images selected in that field you wouldn’t get the grid that I assume you’re after.
What you could try however:
//Remove the default product gallery entirely
remove_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_images', 20 );
//Output the justified image grid instead
add_action( 'woocommerce_before_single_product_summary', 'my_justified_image_grid', 20 );
function my_justified_image_grid() {
the_field('proimages');
}
I don’t know if this will work out-of-the-box.
