DNS records are cached around the internet, so a change can take time to appear everywhere. This is called propagation and usually takes minutes to a few hours, but can take up to 48 hours.
What to check
- Use the DNS lookup to see the current records.
- Use the nameserver checker to confirm the domain points to the right nameservers.
- Clear your browser cache or test from mobile data.
- Check the records for typos.
Read more: How long does DNS propagation take?