WyomingMyst, forum MVP for the Overwatch Forums here, it has come to my observation that embedding certain content is no longer properly displaying on the forum pages and can interfere with out the content is laid out on the page. The video also no longer plays directly in the forum post, instead it opens a separate tab to the YouTube listing itself. Note this only appears to affect the Overwatch forums. (I just tried embedding a video here on the Blizzard forums and it displays normally.)
See the following topic in the URL below as an example: