Youtube videos show up as vertical in mobile

Hi,

In my postings and portfolio page, the Youtube/Vimeo/Vidsee (basically all video embeds) show up as a vertical video instead of a horizontal. Is there a setting to change this so that it shows up correctly? All my stills don’t have a problem resizing to mobile, tablet and desktop.

Here’s links that you should test on your mobile:
Youtube in Posts: http://focusedequipment.com/fcpx-fincher-style/
Youtube in Portfolio: http://focusedequipment.com/portfolio/the-staging-post/
Vimeo in Portfolio: http://focusedequipment.com/portfolio/initial-workflow-stress-test-p/
Vidsee in Portfolio: http://focusedequipment.com/portfolio/dino/

Currently using latest version of theme 3.3.9 and WordPress 4.8. Please advise.

Best,
-Robin