Affecting me too.
Ubuntu: 20.04 LTS
GPU: GeForce RTX 2070

~ uname -r
5.4.0-26-generic

~ xrandr
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 
600mm x 340mm
   3840x2160     60.00*+  30.00  
   2560x1440     59.95  
   1920x1080     60.00    59.94  
   1600x900      60.00  
   1280x1024     60.02  
   1280x800      59.81  
   1280x720      60.00    59.94  
   1152x864      59.96  
   1024x768      60.00  
   800x600       60.32  
   720x480       59.94  
   640x480       59.94    59.93  
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
USB-C-0 disconnected (normal left inverted right x axis y axis)

~ nvidia-smi
Tue Apr 28 16:00:35 2020       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.64       Driver Version: 440.64       CUDA Version: 10.2     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce RTX 2070    Off  | 00000000:26:00.0  On |                  N/A |
|  0%   46C    P8    17W / 185W |   2798MiB /  7979MiB |      3%      Default |
+-------------------------------+----------------------+----------------------+

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1870736

Title:
  [nvidia] Screen scaling 125% gives 200%

Status in gnome-control-center package in Ubuntu:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers package in Ubuntu:
  Confirmed

Bug description:
  Procedure used:
  1.
  Fully updated system via apt update && apt upgrade

  2.
  Select the screen setup in gnome control center

  3. 
  Click the "Fractional scaling" toggle

  4. 
  Select 125% and click the green "use" button top right (it says "Anvend" in 
dansih)

  5.
  Observe that the window has grown a lot, click the "use new settings" button

  6.
  The window tells me, I am at 200% scaling. The "200%" option is now 
highlighted.

  7.
  Switch back to 100% and file this bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.16
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr  4 09:42:34 2020
  InstallationDate: Installed on 2018-01-14 (810 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=da_DK.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to focal on 2020-04-03 (0 days ago)

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