All the sudden contents don't fill 100%

Site URL: https://matthewkoscica.com/play#/ikebana/

For some reason, all of the sudden my main contents doesn't stretch to 100%. Only when creating new pages. Old pages remain 100% stretched. Does anyone know what this if from?
You can see it in the linked page, compared to all other pages on the site.

Thanks!

If I had to guess the issue is some of your recently uploaded images are 1080px wide. Some of the old images are 2500px wide.

The 2500px wide images are able to to better cover very wide browser windows widths and so the images fill the whole window.