I took a look at your video, and there is significant droop or lag in your left eye. There are many causes for this problem. 2 things you definitely need to do. See your regular medical doctor, and ask for some basic blood work, including a thyroid workup. You also need to have your eye doctor take a really good look at your eyelid function.
Thank you for your time. I just set up a an appointment with my PCP (Tomorrow) and have reached out to the eye doc. Hopefully it's nothing serious?