Why are my servers showing as 306.84 when 306.87 is the current build? I have tried restarting them, even tried a rebuild nothing seems to get them to update to the current version

It's the Linux build, not the Windows version. As long as your players can login, there isn't an issue. Server side is not as temperamental as player side versions.

My own cluster is showing the host side as 308.84, and I was able to play without any issues before I went to work a little over 2 hours ago.

*306.84 not 308.84... fat fingers on a smartphone... lol

Yep. What Scratt said. There are currently 8 different server versions of Ark. Listed in update order: Mobile Switch Xbox MSoft Play Anywhere Sony Steam PC Steam Linux Steam Max