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Published blog page d’ont look like my preview

Why there are only 2 images instead of 3 in the first row of my photos posts (tous les articles page) when I look at my site on iPad?

And I had to put 1920 px to have the desired width for my top image shouldn’t it be 620 px? My original image is 1000px wide.

Thank you

Here is my site Read-Only: