the problem is in the mobile version, it is possible to see using the inspection tool. And when the video starts, and the thumbnail image comes out, it becomes even more evident.
actually I found out that it is being caused by the following css code:
:root {
–wd-brd-radius: 0px;
}
however when deactivating it using the javascript code:
var element = document.querySelector(‘.video-home’);
element.style.setProperty(‘–wd-brd-radius’, ‘0px’);