Feature images not being served at correct size

Hi there,

Your images have different dimensions inherently. This is the reason why their sizes are different. They may be 400px in height for instance, but since their aspect-ratio isn’t 400×400 and their widths are different, the rendered sizes will be different width-wise.

What you can do is create a Block Element – Content Template so that you’d be able to control how the images look. Reference: https://docs.generatepress.com/article/block-element-content-template/

You can also control them through custom CSS by adding this through Appearance > Customize > Additional CSS:

:is(.blog, .archive) .post-image img{
    object-fit: cover;
    width: 400px;
}

You can also try defining specific dimensions in Appearance > Customize > Layout > Blog: https://docs.generatepress.com/article/adjusting-the-featured-images/