Custom domain shows "doesn't appear to be served by Netlify" and mobile devices get ERR_SSL_PROTOCOL_ERROR

Hello Netlify team,

I’m experiencing an SSL issue with my custom domain.

Site:
https://kompittu.com

The website is hosted on Netlify and my DNS is managed by Spaceship.

DNS records:

A @ → 75.2.60.5

A @ → 99.83.190.102

CNAME www → kompittu.netlify.app

Nameservers:

launch1.spaceship.net

launch2.spaceship.net

The Netlify dashboard says:

kompittu.com doesn’t appear to be served by Netlify”

Because of this, renewing the Let’s Encrypt certificate fails with DNS verification.

However, my site is actually being served by Netlify.

curl -I https://kompittu.com returns:

HTTP/1.1 200 OK
Server: Netlify
Strict-Transport-Security: max-age=31536000

The DNS configuration matches the official Netlify documentation.

Some mobile devices receive ERR_SSL_PROTOCOL_ERROR while desktop browsers work.

SSL Labs also reported one Netlify edge IP working and another failing.

Could someone please check my domain and SSL deployment on the Netlify edge network?

Thank you.