Renewed certificate for my website hosted in Gitlab Pages isn't getting updated!

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My domain is:

I ran this command: sudo certbot certonly -a manual -d

It produced this output: Asked me to update the site with a file with specific name & contents. Did it, it worked. Got certificates.

My operating system is (include version): Mac OSX 10.11.6

My web server is (include version): Gitlab Pages

My hosting provider, if applicable, is: Gitlab Pages

I can login to a root shell on my machine (yes or no, or I don’t know): No

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): Using their settings pages; the certificate is updated there!

More: I have deleted the old certificate & added the new one. It shows up in settings page, but its not updated.