Pointer hover problem

In Vivaldi when the pointer hovers over the resize slider in the lower right corner of the window, the window reacts as if clicked.
In Libreoffice when I use any keyboard shortcut (control-s, control-c, control-v, etc.) and press only the control key the same thing happens, the window resizes.
In both cases, if I hold down on the control key, the window (in Vivaldi or Libreoffice) continuously gets smaller.
Remember, I’m a Linux newbie. I can follow instructions in the Terminal.
Thanks in advance for your help.

It also happens in Firefox, Inkscape, and Nemo, not in Xed text.

Related? Important release of LibreOffice 7.6.2 Community and LibreOffice 7.5.7 Community with key security fix - The Document Foundation Blog

And in case it matters, here’s my system:

  Kernel: 6.1.53-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 13.2.1 Desktop: Cinnamon v: 5.8.4
    tk: GTK v: 3.24.38 dm: LightDM Distro: Manjaro Linux base: Arch Linux
  Type: Desktop System: Dell product: OptiPlex 7050 v: N/A serial: <superuser required> Chassis:
    type: 3 serial: <superuser required>
  Mobo: Dell model: 0NW6H5 v: A00 serial: <superuser required> UEFI: Dell v: 1.25.0
    date: 04/05/2023
  Info: quad core model: Intel Core i7-7700 bits: 64 type: MT MCP arch: Kaby Lake rev: 9 cache:
    L1: 256 KiB L2: 1024 KiB L3: 8 MiB
  Speed (MHz): avg: 825 high: 900 min/max: 800/4200 cores: 1: 900 2: 800 3: 800 4: 900 5: 800
    6: 800 7: 800 8: 800 bogomips: 57616
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
  Device-1: Intel HD Graphics 630 vendor: Dell driver: i915 v: kernel arch: Gen-9.5 ports:
    active: HDMI-A-1,HDMI-A-3 empty: DP-1, DP-2, DP-3, HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:5912
  Display: x11 server: X.Org v: 21.1.8 driver: X: loaded: modesetting alternate: fbdev,vesa
    dri: iris gpu: i915 display-ID: :0 screens: 1
  Screen-1: 0 s-res: 3360x1050 s-dpi: 96
  Monitor-1: HDMI-A-1 mapped: HDMI-1 pos: primary,left model: Samsung SyncMaster res: 1680x1050
    dpi: 99 diag: 511mm (20.1")
  Monitor-2: HDMI-A-3 mapped: HDMI-3 pos: right model: Samsung SyncMaster res: 1680x1050 dpi: 99
    diag: 511mm (20.1")
  API: OpenGL Message: Unable to show GL data. glxinfo is missing.
  Device-1: Intel 200 Series PCH HD Audio vendor: Dell driver: snd_hda_intel v: kernel
    bus-ID: 00:1f.3 chip-ID: 8086:a2f0
  API: ALSA v: k6.1.53-1-MANJARO status: kernel-api with: aoss type: oss-emulator
  Server-1: JACK v: 1.9.22 status: off
  Server-2: PipeWire v: 0.3.80 status: off
  Server-3: PulseAudio v: 16.1 status: active with: pulseaudio-alsa type: plugin
  Device-1: Intel Ethernet I219-LM vendor: Dell driver: e1000e v: kernel port: N/A bus-ID: 00:1f.6
    chip-ID: 8086:15e3
  IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter>
  Device-2: Ralink RT5370 Wireless Adapter driver: rt2800usb type: USB rev: 2.0 speed: 480 Mb/s
    lanes: 1 bus-ID: 1-10:6 chip-ID: 148f:5370
  IF: wlp0s20f0u10 state: up mac: <filter>
  Device-1: Cambridge Silicon Radio Bluetooth Dongle (HCI mode) driver: btusb v: 0.8 type: USB
    rev: 2.0 speed: 12 Mb/s lanes: 1 bus-ID: 1-4:3 chip-ID: 0a12:0001
  Report: rfkill ID: hci0 rfk-id: 0 state: up address: see --recommends
  Hardware-1: Intel SATA Controller [RAID mode] driver: ahci v: 3.0 bus-ID: 00:17.0
    chip-ID: 8086:2822
  Local Storage: total: 953.87 GiB used: 117.41 GiB (12.3%)
  ID-1: /dev/sda vendor: Kingfast model: N/A size: 953.87 GiB speed: 6.0 Gb/s serial: <filter>
  ID-1: / size: 493.19 GiB used: 117.36 GiB (23.8%) fs: ext4 dev: /dev/sda5
  ID-2: /boot/efi size: 96 MiB used: 43.3 MiB (45.1%) fs: vfat dev: /dev/sda1
  Alert: No swap data was found.
  System Temperatures: cpu: 37.0 C mobo: N/A
  Fan Speeds (rpm): N/A
  Packages: 1296 pm: pacman pkgs: 1286 pm: snap pkgs: 10
  Active pacman repo servers in: /etc/pacman.d/mirrorlist
    1: https: //mirror.albony.xyz/manjaro/stable/$repo/$arch
    2: https: //mirrors.xtom.ee/manjaro/stable/$repo/$arch
    3: https: //quantum-mirror.hu/mirrors/pub/manjaro/stable/$repo/$arch
    4: https: //mirror.dkm.cz/manjaro/stable/$repo/$arch
    5: http: //free.nchc.org.tw/manjaro/stable/$repo/$arch
    6: https: //mirrors.jlu.edu.cn/manjaro/stable/$repo/$arch
    7: https: //ba.mirror.garr.it/mirrors/manjaro/stable/$repo/$arch
    8: https: //mirror.kamtv.ru/manjaro/stable/$repo/$arch
  Processes: 256 Uptime: 19h 6m Memory: total: 32 GiB available: 31.21 GiB used: 5.5 GiB (17.6%)
  Init: systemd v: 254 default: graphical Compilers: gcc: 13.2.1 clang: 16.0.6 Client: Cinnamon
  v: 5.8.4 inxi: 3.3.30

Honestly, that looks to me like there is a key locked on the keyboard because of dirt or a mechanical problem. Clean up your keyboard first…

When does this problem start?