I have made a possible change, which I think had to do something with the shortcode not properly executing. I have checked via VPN and gtmetrix websites after clearing the cache, and it seems to be okay.
It was basically a conflict somewhere, but I could not find the exact cause. I have added a piece of code to register the shortcode in a different way as well, and that seemed to have done the trick. I will include this solution in the upcoming release as well – so you don’t have to worry about it anymore.