It seeams that the pluggin is not able to get from the Theme the width of the screen, so it is not fitting correctly the video on the screen. In this website (not working properly) the language is not English.
I have the same problem in one of my websites.
I have 2 websites 90% similar one to another (theme, plugins and conf). One works fine, but in the other, on mobile, the video appears larger than the screen (causing problems on Google search console) and on desktop the video is appears smaller than it used to be.
