Gallery always loads 2500w images!

I have a small website based on the Carson template. I have altered it slightly; mostly tweaking CSS and inlining multiple galleries after each other on the index page. I have limited with the width of page with a max-width stmt on the main content.

Here's the issue; images in the galleries are always loaded at 2500w. I would expect it load at a size that is closer to the width of the viewport.

My site: https://jrydberg.com