Can't install SSL while domain is pointing to correct IP

So I have my website andrew.at.tw running on Google compute engine with a reserved static IP. What I’m occurring here is I kept getting the following issue while the A record is pointing to the correct IP and I can also access the NGINX page (the page you’ll see after installation). I even successfully install let’s encrypt SSL with the guild here.

What’s the problem and how to solve it?

✖ Setting up SSL
A SystemError occurred.

Message: Your domain name is not pointing to the correct IP address of your server, please update it and run `ghost setup ssl` again

Debug Information:
    OS: Ubuntu, v16.04
    Node Version: v8.11.3
    Ghost-CLI Version: 1.8.1
    Environment: production
    Command: 'ghost setup ssl'

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