Nginx serving wrong site

[James Read]

My nginx server is serving the wrong site. I found this explanation online
https://www.computerworld.com/article/2987967/why-your-nginx-server-is-responding-with-content-from-the-wrong-site.html
However this explanation doesn't seem to fit my case as I have a location
which nginx should match correctly. Is there any other reason why nginx
would serve the wrong site?
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