Feed doesn’t load sometimes

Hi,

I’m helping to my client to set the Instagram slider and everything works well except sometimes it simply doesn’t load completely, it starts loading and I see long scroll bar and huge empty space where the slider should load.
It usually happens when the page is loaded by the first time in the browser, after reload it works okay.

What could possibly cause this? I don’t see any errors in console, there isn’t any caching or script optimization plugins installed, no CDN, CloudFlare or anything that could break the scripts.

Theme is Bridge by Qode.

The website is in development at the moment, the slider is set on two pages. URL: https://developmentview.net/jacksonaces/
https://developmentview.net/jacksonaces/about/

This is the shortcode I set:
[iscwp-slider username=”jacksonacesmagic” limit=”25″ slidestoshow=”5″ dots=”false” autoplay=”true” autoplay_interval=”3000″]

Thanks in advance.

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