When the videos are uploaded on my site they are displayed very small. Is there a setting or is this something I need to code something like doing inspect element to change the size? They are small and in some cases the ratios is wrong and it's squeezing the videos.
Can you provide a screenshot and let us know if this is just in the feed or if it's also in the video section? Are you using default SE video plugin or a third party plugin?
This one works on the demo, https://youtu.be/MadMX3wFbr0 in case you want one to test with. It's baby orangutans.