Absolutely, and I think I've got this:
Either it has something to do with when the poster posts the link as mobile, eg, m.youtube.com/somevideo and/or
The embedded clip piece of this site doesn't work well anymore (or youtube doesn't process them well anymore).
I will bet you are accessing this from a phone or tablet, right?
If so, instead of clicking the play button in the clip, click the link at the top of the embedded video and a popup will show you the video directly from youtube. At least, that's what happens to me.
I believe the embedded video feature works MUCH better from a PC.
Please let me know.