Trying to upgrade to 1.820 - response: webmin is already the newest version (1.810).

Hi

I’m trying to upgrade webmin on 2 servers, but I’m told I already have the latest version.
Response is: webmin is already the newest version (1.810).

It’s on ubuntu 16.04 and Debian 8. I have 2 other servers that also runs Debian 8, who updated to 1.820 without issues.
What can cause this?

The 2 who updated are VPS from hetzner
The 2 who don’t update are dedicated servers from hetzner