Hi, @simeon9696. TTLs (time to live values) are likely the cause:
If it does not work, on a system then you can find out why using the command line tool gid like so:
dig coronavirustt.info NS
This will show the TTL value for the NS records for that system’s upstream resolver.
When I test I see the DNS name servers used by Netlify DNS:
$ dig coronavirustt.info NS +noall +answer
; <<>> DiG 9.10.6 <<>> coronavirustt.info NS +noall +answer
;; global options: +cmd
coronavirustt.info. 3599 IN NS dns1.p05.nsone.net.
coronavirustt.info. 3599 IN NS dns2.p05.nsone.net.
coronavirustt.info. 3599 IN NS dns3.p05.nsone.net.
coronavirustt.info. 3599 IN NS dns4.p05.nsone.net.
The value is in seconds so, if the issue was waiting for those records to expire from the cache, then it would take one hour for them to expire.
If there are other questions about this, please let us know.