Floating panels change positions after the program restarts

[DavidHJong]

Describe the bug
Floating panels move downward and rightward a little bit after the program restarts.

How to Reproduce

1. start QGIS without any project opened.
2. Create a new user profile
3. open a panel, say, layer panel
4. Undock it to make it a floating panel.
5. remember the position of that floating panel
6. close the program and start it again.
7. check that panel's position.

this is the first-time's position

this is the position after the program restarts.

QGIS and OS versions

QGIS: 3.10.3-A
windows 10 pro: 1903

Additional context

[Pedro-Murteira]

This is still true on QGIS 3.16.14 and 3.22.1.

[igithepop]

This is still true on QGIS 3.36
they move in unison, strictly downwards i equal steps with each restart.