SUMMARY
On all my screen tablets i've tried so far, I have a consistent offset of the pen cursor to right of about 1-2mm which places it too far from the pen tip, it is also blocked out of view by the pen then.
In comparison the proprietary calibration tool of the xp-pen tablets places the cursor correctly.

The result is constant.

STEPS TO REPRODUCE
1. Calibrate the pen via the built-in tool.
2. Observe the position of the cursor when putting the pen onto the screen.

OBSERVED RESULT
The Cursor is about 1-2mm too much to the right and completely blocked out by the pen which makes drawing hard.

EXPECTED RESULT
The Cursor being right at the end of the tip of the pen.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux / Fedora 
KDE Plasma Version: 6.4.1
KDE Frameworks Version: 6.15
Qt Version: 6.9.1

ADDITIONAL INFORMATION
Notice this has occured for me on XP-Pen, MPP AES devices.
Pen Monitors this has been observed on:
(On Desktop PC)
- XP-Pen 24HD
- XP-Pen 16TP

(Standalone Systems)
- HP Elite x2 G4
- Dell Latitude 7210 2in1