CDN hostname not changing all urls

We have setup the CDN on the website to make all file assets like js,css be hosted on a CDN and the hostname has been changed from u3v8m5r8.stackpathcdn.com to assets.oand3.com which works fine for all media apart from svg/images/fonts.

These files still route to u3v8m5r8.stackpathcdn.com and i cant see how to get them to behave like the css/js files. Its got so bad i have added a 301 within stackpath to route any media requests to the assets.oand3.com domain but this is not a viable solution.

Regards

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