Thanks for the clarification. I will get in touch in case I need any further assistance.
Thank you

Also, I think I forgot to tell, that the video player switches to the default player when played on these devices. Not sure why.

Hey Juraj,
Thanks for your interest.
So I have tried on a couple of servers like hostgator, flywheel and siteground and found the same issue on all, but just with the above mentioned devices.
Here are the URLs
http://billhoffman.flywheelsites.com/reel/
https://billhoffman.tv/reel/