Production site trying to load from local server

So I have a strange issue. I've just pushed my site to production server, it's a AWS Elastic Beanstalk setup. Everything seemed to go well but then half the site starts trying to load from my development server (http://127.0.0.1:8000).

Its really strange, some of the page loads from the correct domain and then I get a load of CORS errors.

I've set an assets and app url in my ENV file and in the AWS configuration.

Any ideas what might be going on?