NAS disk space not reported correctly

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Hello, new Netdata user here. I’m evaluating Netdata for monitoring Synology and QNAP NAS devices using Docker. I’m not seeing the correct amount of space being reported. THis NAS has 8x4TB drives. btrfs.disk shows some credible numbers but disk.space is somehow getting 8TB. Does anyone know what is happening?

Docker compose:

version: '3'
services:
  netdata:
    image: netdata/netdata:stable
    container_name: netdata
    pid: host
    network_mode: host
    restart: unless-stopped
    cap_add:
      - SYS_PTRACE
      - SYS_ADMIN
    security_opt:
      - apparmor:unconfined
    volumes:
      - /volume1/docker/netdata/data/netdata_netdataconfig:/etc/netdata
      - /volume1/docker/netdata/data/netdata_netdatalib:/var/lib/netdata
      - /volume1/docker/netdata/data/netdata_netdatacache:/var/cache/netdata
      - /:/host/root:rslave,ro,rshared
      - /etc/passwd:/host/etc/passwd:ro
      - /etc/group:/host/etc/group:ro
      - /etc/localtime:/etc/localtime:ro
      - /proc:/host/proc:ro
      - /sys:/host/sys:ro
      - /etc/os-release:/host/etc/os-release:ro
      - /var/log:/host/var/log:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - /run/dbus:/run/dbus:ro
    environment:
      - NETDATA_CLAIM_TOKEN=*****
      - NETDATA_CLAIM_URL=https://app.netdata.cloud
      - NETDATA_CLAIM_ROOMS=*****

What I see in the dashboard:

image
image443×139 3.65 KB