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Plex LXC (unprivileged) using 100% SWAP?
(i.imgur.com)
Proxmox VE is a complete, open-source server management platform for enterprise virtualization. It tightly integrates the KVM hypervisor and Linux Containers (LXC), software-defined storage and networking functionality, on a single platform. With the integrated web-based user interface you can manage VMs and containers, high availability for clusters, or the integrated disaster recovery tools with ease.
Yeah this is a fundamental misunderstanding of how swap works on modern systems. Unfortunately a common one as well. Lots of people think using swap is bad and that they should eliminate it or that they need more RAM when they really don't.
Just as likely to be disk caching. Sometimes it's counted as using memory and sometimes not.