Custom hyperlinks with custom fields

I have a situation where:

– I need to create a custom link per image on an image gallery. I have created a text field with HTML outputting so that hyperlinks get converted automatically.
– The user will be populating that field with the link every time a new post is created.
– I am using a custom post type (post-portfolio).
– Each post has a cover image that will be a thumbnail when looking at the gallery.
– Those links will later on be displayed as a link on the thumbnail of the image – not on the image’s lightbox or single-post page.
– The gallery’s default behavior is to have two font-awesome icons acting as buttons/links: Lightbox view and single post permalink. I have now added a new font awesome link/button to have that text field acting as the link’s target.

The code on the functions.php:

if(function_exists("register_field_group"))
{
register_field_group(array (
'id' => 'acf_sponsorer-lank',
'title' => 'Sponsor hyperlänk',
'fields' => array (
array (
'key' => 'field_56ea5ece13165',
'label' => 'Sponsor länk till webbsida',
'name' => 'sponsor_lank_till_webbsida',
'type' => 'text',
'instructions' => 'Skriv här webbsidan till sponsorn. Om det inte finns någon webbsida skriv endast #',
'required' => 1,
'default_value' => '',
'placeholder' => '',
'prepend' => '',
'append' => '',
'formatting' => 'html',
'maxlength' => '',
),
),
'location' => array (
array (
array (
'param' => 'post_type',
'operator' => '==',
'value' => 'post-portfolio',
'order_no' => 1,
'group_no' => 1,
),
),
),
'options' => array (
'position' => 'normal',
'layout' => 'default',
'hide_on_screen' => array (
),
),
'menu_order' => 0,
));
}

The code on the gallery that shows all thumbnails:

$variable = get_field('sponsor_lank_till_webbsida', $post->post-portfolio);

<div class="acts">
<h3>'.get_the_title().'</h3>
<a href="'.$url.'" title="'.get_the_title().'" class="icon-search" rel="prettyPhoto[gallery1]"><!----></a>
<a href="'.the_field('sponsor_lank_till_webbsida', get_option('acf_sponsorer-lank')).'" class=" icon-h-link" target="_blank"><!----></a>
<a href="'.get_permalink().'" class=" icon-link"><!----></a>
</div>

A note on the last bit of code I wrote:

The <div class="acts"> is inside of PHP tags, so no need to open and close it there.

Problem:

The custom field is showing up where on the custom post type page when the admin creates a new post, but the link on the gallery page has no target (the value that the user inserts on the post creation page).

I have been reading the documentation and trying so many times and so many ways but I cannot seem to make it work. Can please somebody help me?