Python Editor: Cursor Offset and Blurry Font, Display Upscaling
There is an offset of the cursor when writing code in the processing python editor no matter the font and the scale of the windows. Probably due to a font error.

The font of my current file, mode, logo are blurred on 125% (in Windows preference display settings) even if I told the .exe to use Application settings.

I suspect this might have something to do with the preference files. I also had some weird font issues after I ran Processing 3 and 4 on the same machine.
You can try set a fresh new sketchbook location (File > Preferences > Sketchbook location). Then, close Processing; delete <user>\AppData\Roaming\Processing; then open it again.
I would not recommend Processing 4 with Python Mode. Instead, use Processing 3.5.4.
I have this same issue in java mode in Processing. Very frustrating. Some fonts are better than others.
https://github.com/processing/processing4/issues?q=is%3Aissue+is%3Aopen+font