I’m having same problem. Image set at 400 x 400 but the full size image is used regardless.
Archive pages have now doubled in size – thanks Bill!!
Figured this out as an issue with ‘wordpress responsive images’. So what happens is the grid is using the image as intended but wordpress is adding all the alternative image options to your source code.
This means if you open the image you get the maximum size that will fit your screen.
So this useful function that nobody wanted or needed can be disabled thus:
//* Disable Responsive Images
add_filter( ‘max_srcset_image_width’, create_function( ”, ‘return 1;’ ) );
