Mouse speed (sensitivity) bug in debian buster/bullseye, ubuntu 18.04.4 lts, ubuntu 20.04 lts

[KoreanFanOfficial]

I have problems with mouse sensitivity settings. I am using Debian stable
and bullseye,Ubuntu 18.04.4, 20.04 LTS. I use the default mouse
acceleration profile and the mouse speed is set to the minimum value. But a
few seconds after setting these values, the mouse speed changes without my
permission. So i go to terminal and use command xinput list-props 11 and i
got the same "libinput Accel Speed (295): -1.000000 and libinput Accel
Profile Enabled (298): 1, 0" But this value match to minimal mouse speed
and default mouse accel profile. Those settings didn't changed, but mouse
speed is different. Why this happends?
my settings:
xinput list
⎡ Virtual core pointer                    id=2 [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              id=4 [slave  pointer  (2)]
⎜   ↳ Logitech M185                            id=11 [slave  pointer  (2)]
⎜   ↳ Logitech K270                            id=12 [slave  pointer  (2)]
⎣ Virtual core keyboard                    id=3 [master keyboard (2)]
    ↳ Virtual core XTEST keyboard              id=5 [slave  keyboard (3)]
    ↳ Power Button                            id=6 [slave  keyboard (3)]
    ↳ Power Button                            id=7 [slave  keyboard (3)]
    ↳   USB Keyboard                          id=8 [slave  keyboard (3)]
    ↳   USB Keyboard System Control            id=9 [slave  keyboard (3)]
    ↳   USB Keyboard Consumer Control          id=10 [slave  keyboard (3)]
    ↳ Logitech K270                            id=13 [slave  keyboard (3)]

xinput list-props 11
Device 'Logitech M185':
Device Enabled (149): 1
Coordinate Transformation Matrix (151): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Natural Scrolling Enabled (284): 0
libinput Natural Scrolling Enabled Default (285): 0
libinput Scroll Methods Available (288): 0, 0, 1
libinput Scroll Method Enabled (289): 0, 0, 0
libinput Scroll Method Enabled Default (290): 0, 0, 0
libinput Button Scrolling Button (291): 2
libinput Button Scrolling Button Default (292): 2
libinput Middle Emulation Enabled (293): 0
libinput Middle Emulation Enabled Default (294): 0
libinput Accel Speed (295): -1.000000
libinput Accel Speed Default (296): 0.000000
libinput Accel Profiles Available (297): 1, 1
libinput Accel Profile Enabled (298): 1, 0
libinput Accel Profile Enabled Default (299): 1, 0
libinput Left Handed Enabled (300): 0
libinput Left Handed Enabled Default (301): 0
libinput Send Events Modes Available (269): 1, 0
libinput Send Events Mode Enabled (270): 0, 0
libinput Send Events Mode Enabled Default (271): 0, 0
Device Node (272): "/dev/input/event5"
Device Product ID (273): 1133, 16392
libinput Drag Lock Buttons (286): <no items>
libinput Horizontal Scroll Enabled (287): 1

Also i try to use this conf file
/usr/share/X11/xorg.conf.d/50-mouse-acceleration.conf
Section "InputClass"
Identifier "My Mouse"
MatchIsPointer "yes"
Option "AccelerationProfile" "-1"
Option "AccelerationScheme" "none"
Option "AccelSpeed" "-1"
EndSection
But no success.
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