Post Images No Longer Responsive

Hi,

I am using WordPress V4.4.4 and in previous posts and pages that I have published the images have been automatically resized for mobile devices.

However, I have just published a new post and the images in it are not re-sizing to smaller versions on mobile devices.

Here is an older post where the images scale down correctly on mobile – https://coffeepodshop.com.au/is-this-the-end-of-the-nespresso-system-as-we-know-it/

And here is the latest post in which the images are NOT scaling down on mobile – https://coffeepodshop.com.au/15-crazy-things-every-espresso-drinker-experienced/

Please could someone explain why the images are not responsive on my latest post?

I have tried regenerating thumbnails with no success.

Thanks in advance