It sounds like when the pen tip is near, it's actually registered as a click hence it's erasing. It could be a driver or settings issue, or pen problem.
Try testing the pen with other drawing apps to see if the problem is repeatable. Try with Medibang Paint and Krita (both free).
Then reset the Wacom driver settings. Or reinstall Wacom driver to test.
@Leon
Not sure why that's happening.
It sounds like when the pen tip is near, it's actually registered as a click hence it's erasing. It could be a driver or settings issue, or pen problem.
Try testing the pen with other drawing apps to see if the problem is repeatable. Try with Medibang Paint and Krita (both free).
Then reset the Wacom driver settings. Or reinstall Wacom driver to test.