Error with get_permalink()

Hi there.

I’m getting an error with the get_permalink() code. I have this code to display the link of the page:

<?php
            /*global $query_string;
            query_posts( $query_string . '&order=ASC' );*/
            $args = array('post_type' => 'page', 'posts_per_page' => '6', 'post__not_in'=>array('3491', '77','73','58') );
            $loop = new WP_Query($args);
            while ($loop->have_posts()) : $loop->the_post();

                $feat_image = wp_get_attachment_url(get_post_thumbnail_id($post->ID));
                ?>

                <li class="col-lg-4 col-md-4 col-sm-6 col-xs-12 prod">
                    <img src="<?php echo $feat_image; ?>">

                    <div class="prod_hov col-lg-4 col-md-4 col-sm-6 col-xs-12">
                        <h1><a href="<?php the_field('link'); ?>"><?php the_title(); ?></a></h1>
                    </div>
                    <div class="prod_shad col-lg-4 col-md-4 col-sm-6 col-xs-12">
                        <h1><?php echo get_the_title(); ?></h1>
                        <p><?php the_excerpt(); ?></p>
                        <h2><a href="<?php echo get_permalink(); ?>">saber mais</h2>
                    </div>

                </li>

            <?php endwhile; ?>

and the result displays this:

<li class="col-lg-4 col-md-4 col-sm-6 col-xs-12 prod">
                    <img src="https://localhost:8080/sites/bioportugal/wp-content/uploads/2016/01/ci--ncias-da-vida2.jpg">

                    <div class="prod_hov col-lg-4 col-md-4 col-sm-6 col-xs-12">
                        <h1><a href="">CIêNCIAS DE VIDA</a></h1>
                    </div>
                    <div class="prod_shad col-lg-4 col-md-4 col-sm-6 col-xs-12">
                        <h1>CIêNCIAS DE VIDA</h1>
                        <p></p><p>Especialmente focados no utilizador de técnicas de Biologia Molecular.</p>
                        <h2><a href="https://localhost:8080/sites/bioportugal/ciencias-de-vida/">saber mais</a></h2><a href="https://localhost:8080/sites/bioportugal/ciencias-de-vida/">
                    </a></div><a href="https://localhost:8080/sites/bioportugal/ciencias-de-vida/">

                </a></li>

as you can see the permalink code is duplicating the “a” tag, is there any solution to this?

Thanks.