img CSS not matching up

I’ve recently made some changes to the css in the style.css of my custom theme so that the images would fit the content (width: 100%;) and decided to change it back to max-width: 100% but for some reason that CSS is still being kept somewhere.

Example : https://classicaltrax.org/2015/10/21/classical-trax-open-gym/

if you inspect the element, you’ll see that it has the property width:100%

but if you look at my CSS you can quite clearly see that it is no where.

img {
display: block;
border-radius: 2px;
max-width: 100%;
height:auto;
margin-left: auto;
margin-right: auto;
}

Any one have any ideas why this might be happening?

I’ve tried to re- upload images and add them back in but with no such luck.

Thanks