Check https://forum.proxmox.com/threads/install-windows-2016-server-on-proxmox-ve-video-tutorial.31344/
=> Intall Balloon Service
You have to install balloon driver, then install and start balloon serviceAlso note that difference between memory statuses, I thought it was on windows servers. It happens to me in 2003, 2008 and 2012 in all cases with the baloon driver installed.
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