Title says it all. Here is 338.35 while everywhere else it's 338.40 or 338.41.

And restarts do not fix it.

This host runs on Linux. the Linux server distro, Windows Server Distro, Steam CLient Distro, etc, all have separate client numbers.

WildCard controls the Linux distro.

You can see what WildCard has pushed lately to the distro here:

https://steamdb.info/depot/376031/history/

Right, the linux version came out 7 hours after the PC one. Hmmm, lul.