NS records for subdomain not propagating

I created a couple of subdomain NS records pointing to a set of external DNS servers. For some reason, these only propagate to a few locations and these locations keep changing. Its not uniformly propagating. I can see this on DNS Checker - DNS Propagation Check & DNS Lookup. Not sure what is going on?

If recently added/created, it can tak up to 24 hours for DNS propagation around the World.

May I ask what is your main domain and your sub-domain?

May I ask have you added your sub.example.com DNS record with the correct IP address under “value/content” to the DNS dashboard for your domain at your Cloudflare account?

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It’s been a couple of days since we added this. We removed and re-added again about 24 hours ago.
The main domain is elecktra.net. The subdomain is _acme-challenge.elecktra.net. The reason for adding the NS records is to validate ownership of the domain for greengeeks.com where we are hosting a WP site at content.elecktra.net so that we can add a Let’sEncrypt cert. These NS records are failing to propagate and we are unable to add the cert.

We are following the instructions at options 2 on this page:

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