Cloudmin doesn't show update

I’m running multiple VM’s from Cloudmin, most of them CentOS 6 and the one that has my main Cloudmin from where I manage other machines is running CentOS 7.
In “List Managed Systems” I see updates, and in each machine one of the updates is webmin update, except for the CentOS 7 machine!
Now, if I go to “System Information” of the CentOS 7 machine, I see there is a Webmin update available.
Does anybody have an idea why the update is not displayed in “System Information” like with the rest of the machines?