Grande lacuna entre o chat e o contêiner do tópico

When we trigger the livestream chat for our events, this large gap appears in the
div.container.post::before. Spacing is fine until I trigger the transformation with the tag.

I tried tinkering with CSS to adjust this element, but couldn’t figure it out. If I hide the ::before, an ::after appears. When I hide both, the spacing persists.

Here is the page if someone wants to see it live.

This spacing does not appear in the offical screenshot, so I’m not sure what’s going on: