No blank space for images in the browser

Hi, I have a weird problem with my images uploaded with the Gutenberg Editor. As I found out Gutenberg Editor adds height and width automatically to the images. I have controlled it and that works. But nevertheless some images are not recognized by the browser even though they have a defined height and width. And these images are causing a Layout Shift on my site. For example:

This featured images has a placeholder in the browser: https://imgur.com/a/4nVz0v4
But there is no placeholder for the Pinterest Image on the same site and it shifts: https://imgur.com/a/dj7z4oC

I don’t know why this is happen. Can someone help me?

Greetings Kathrin

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