Dynamic DNS won't update

[gigaboy]

Using Cloudflare as DDNS intermediary.  Despite repeated reboots and restarts in the dashboard, the cached IP address will not update (currently the old IP in red).

Is there a script I can install into Cron which will solve this problem?  Or is there another way to make it work?

[nhtrung]

Before you use Dynamic DNS, you must understand about it.
How Does Dynamic DNS Work? Read the article below:
https://www.noip.com/blog/2010/10/27/how-does-dynamic-dns-work/