“Your connection is not private”

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My thought is that they are clustering your site and some of the systems are using an old cert, notice the expired cert encountered below.
Furthermore, not all systems are configured the same, notice the etag entry and then none.

curl -Ii https://www.duits.co/
HTTP/2 200
server: nginx/1.16.1
date: Tue, 10 May 2022 07:43:53 GMT
content-type: text/html
content-length: 8015
last-modified: Wed, 20 Jan 2021 12:45:51 GMT
etag: "1f4f-5b95455c63dc0"
accept-ranges: bytes
vary: Accept-Encoding,User-Agent

curl -Ii https://www.duits.co/
HTTP/2 200
server: nginx/1.16.1
date: Tue, 10 May 2022 07:43:55 GMT
content-type: text/html
content-length: 8015
last-modified: Wed, 20 Jan 2021 12:45:51 GMT
accept-ranges: none
vary: Accept-Encoding,User-Agent

curl -Ii https://www.duits.co/
curl: (60) SSL certificate problem: certificate has expired
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