Wrong aspect ratio on ONE video

Site URL: https://jasonwyates.squarespace.com/short-films

Hi,

I'm putting together a page of video samples. It's a gallery of YouTube videos embedded in a page.  (using the "Stacked" design option)

For some reason, one of the videos ("Cloyd" - the third one down) is showing up as 4:3 instead of 16:9. Everything else is functioning correctly.

Its confusing, because both the original YouTube video, as well as the thumbnail image are 16:9. I even tried using the image editor to re-crop the thumbnail to 16:9 to be sure.

Is there a setting somewhere I'm missing? I don't see anything about aspect ratio in either the page gallery settings, or the gallery itself.

thanks!