This is on an iPad using safari as a browser. Any video in the first few lines of a new thread is cut in two and can’t be expanded so you only see half the video because the site sponsor banner in that first post cuts off the window. This is the same both in landscape and in portrait. If the sponsor banner was at the top, rather than to the right (as it is currently) such that the first post text appeared underneath I don’t think this would happen.