Different ranking posts shown on different pages

Hello,

I have a list of WPP Posts on the sidebar of my site.
For some reason, the sidebar shows a different list of posts depending which page you’re on. Logically this shouldn’t be the case, so I would be very grateful if you could help me get to the bottom of this.

If you click on the link I attached, and choose one of the other posts from the sidebar, you should see a different list of sidebar posts.
This only seems to happen in secret/incognito mode.

My WPP query args are as follows:

$args = array(
      'limit' => 5,
      'range' => 'custom',
      'time_quantity' => 14,
      'time_unit' => 'day',
      'freshness' => 1,
      'cat' => '-2545',
      'thumbnail_width' => 75,
      'thumbnail_height' => 75,
      'stats_date' => 1,
      'stats_date_format' => 'Y.m.d',
      'wpp_start' => '<ol class="ranking__list">',
      'wpp_end' => '</ol>',
      'post_html' => '<li class="ranking__list--item"><a href="{url}"><div class="ranking__thumb">{thumb_img}</div><div class="ranking__body"><div class="ranking__text"><p>{text_title}</p></div><div class="ranking__date"><time datetime="{date}" itemprop="datePublished">{date}</time></div></div></a></li>'
    );
wpp_get_mostpopular($args);

WP version: 5.8.4
WPP version: 5.5.1

Thank you.

The page I need help with: [log in to see the link]