First time posting on this forum; apologize in advance if I am not doing
this right.

I have the same problem. I have three monitors (1 4k, 2 1080p [1 16:10
and 1 16:9]). 1080p 16:10 monitor is set as primary display, but is
Monitor 2 in the physical connections.

Stuff on primary monitor (16:10) stays put; stuff on the 4k monitor and
the secondary 16:9 monitor move around.

$ sudo lshw -class display
  *-display                 
       description: VGA compatible controller
       product: Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: e7
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=amdgpu latency=0
       resources: irq:209 memory:a0000000-afffffff memory:b0000000-b01fffff 
ioport:5000(size=256) memory:b0900000-b093ffff memory:c0000-dffff


Attachment: 

1. output of dbus-send --session --print-reply
--dest=org.gnome.Mutter.DisplayConfig /org/gnome/Mutter/DisplayConfig
org.gnome.Mutter.DisplayConfig.GetCurrentState

2. output of ls /sys/class/drm/*/edid | xargs -i{} sh -c "echo {};
parse-edid < {}"

** Attachment added: "Output of debus-send and edid commands"
   
https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1927948/+attachment/5499276/+files/monitor-output.txt

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https://bugs.launchpad.net/bugs/1927948

Title:
  Windows switch monitor after resuming from sleep

Status in GNOME Shell:
  Unknown
Status in Mutter:
  Unknown
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  What I expect:

  Window layout/positioning is identical after resume from sleep.

  What I observe:

  After resume from sleep, windows appear on a different monitor than
  before.

  I found this possibly relevant GNOME bug:

  https://gitlab.gnome.org/GNOME/mutter/-/issues/1419

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: mutter 3.38.4-1ubuntu2
  ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
  Uname: Linux 5.11.0-16-generic x86_64
  ApportVersion: 2.20.11-0ubuntu65
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May 10 13:40:28 2021
  InstallationDate: Installed on 2019-12-02 (524 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  SourcePackage: mutter
  UpgradeStatus: Upgraded to hirsute on 2021-05-05 (4 days ago)

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