My images link me back to my homepage although the link in the url bar is correct

<?php

add_theme_support('menus');
add_theme_support('post-thumbnails');

function namespace_register_menus() {
    register_nav_menus(
        array(
            'primary-menu'  => __( 'Primary Menu')
        )
    );
}

add_action( 'init', 'namespace_register_menus' );


function wpt_theme_styles() {

    wp_enqueue_style( 'googlefont_css', 'https://fonts.googleapis.com/css?family=Roboto'
      );
      wp_enqueue_style( 'style', get_stylesheet_directory_uri() . '/style.css');

}




add_action('wp_enqueue_scripts','wpt_theme_styles');

 ?>

<?php  get_header(); ?>

<!--    jumbotron image-->
<header class="jumbotron jtron img-fluid">

    </header>

<!--    main container-->
    <button type="button" class="btn btn-info wide-btn">Click here for a free quote</button>

    <div class="container-fluid">


<!--        1st sub container-->
        <div class="container mb-4">
        <p class="pg1">DV Electric is a family-owned company from the Bay-Area that serves the electrical needs of the local community.Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. </p>

        <button type="button" class="btn btn-info abt-btn ">About Page</button>


    </div>

<?php get_footer(); ?>

<?php
/*
  Template Name:Project Page
*/

?>

<?php
    get_header();
?>


<?php if(have_posts()) : while(have_posts()) : the_post(); ?>
        <h1><?php the_title(); ?></h1>
        <?php the_content(); ?>
    <?php endwhile; endif; ?>

  <?php
      $args = array(
        'post_type' => 'portfolio'
      );
      $query = new WP_Query($args);
    ?>


    <section class="row">
      <?php  if($query->have_posts()) : while($query->have_posts()) : $query->the_post(); ?>
        <div class="col">
          <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('medium'); ?></a>
        </div>
      <?php endwhile; endif; wp_reset_postdata(); ?>
    </section>


 <?php
    get_footer();
 ?>