Access-Control-Allow-Origin set but not coming through

I have set the Access-Control-Allow-Origin header to * in WordPress. When I test it out in Paw, I get the header in the response. When I do curl -I theaddress, I get the header in the response.

HTTP/1.1 200 OK
Server: nginx/1.11.1
Date: Mon, 08 May 2017 21:58:52 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST, OPTIONS, HEAD, PUT, DELETE, TRACE, CONNECT, PATCH

However, when I test it out on https://resttesttest.com it throws an error saying that there’s a problem with the CORS headers. Any ideas as to what could be causing this?

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