Youtube video shows up twice and messes up the post

I have another question. How could I make the video bigger? Thanks!

Hi @riversky, 

The problem started when I posted a youtu.be link that I actually got from youtube.  I think that youtu.be link is a problem because when fixed one of the the posts (by using youtube.com link)

This should work fine on our test websites. However, if you provide us admin access we'll check it on your website as well. If it possible, change the current user role to admin. 

I have another question. How could I make the video bigger? Thanks!

As far as we check the issue, I'll be able to provide CSS code for you.