Is it that your tags are being stripped, or that you aren’t preparing them prior to displaying them. Try wrapping your output:
echo apply_filters('the_content', get_post_meta($post->ID, '_custom_field_name', true));
Is it that your tags are being stripped, or that you aren’t preparing them prior to displaying them. Try wrapping your output:
echo apply_filters('the_content', get_post_meta($post->ID, '_custom_field_name', true));