Video in post are grayed out and not showing

Hi Team,

I hope you are well.

I needed a 3 column display theme and I have chosen the Hueman.
I have activate and published the theme and I realised that on my Home / blog page, the post are not showing the video. They look like gray rectangle.

When I create the post I am using the Youtube block type.

Please could you look into this and help me to resolve this issue ?

Many thanks,

Charlotte

The page I need help with: [log in to see the link]