Using static page as front page, link on instagram displays placeholder post

Hi, I have a problem, not sure if it is instagram or this plugin, I hope you can help.

I set up a page with a static HTML page as front page. In order to do that, I had to create a placeholder static page in WordPress that is selected as FrontPage in the general settings. The static page is loaded in its stead. Working fine from the browser. When posting the homepage link on instagram, it does not load the static page but the placeholder and is taking a screenshot of that instead. Not sure what I’m doing wrong here. There’s no redirects happening that could cause a bot to drop out. Not sure if it’s a javascript as the page is basically just a big animated canvas, but that should at least show the background color not the placeholder page. So the question is, why is the static page not loaded at all? Caches are cleared.

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