Pixellated image for wrong size in lazyload

Hi,
When I have activated the option “Automatic Scaling
Automatically detect the correct image size within responsive (srcset) markup. ” I have a problem in the first image of this slider.
The page it says sizes="40px". It does not happen in other images.
Deactivating Automatic Scaling I can see the image well. Also resizing the page, the attribute sizes show the right px and I can see the image not pixellated.

How can I resolve?

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