My daughters reply
1- Jittering happens anywhere on the screen
2- don't know what you mean by straight line mode, the cursor jitters when drawing straight lines, curved lines or just moving the cursor around
3- don't know what you mean by gap, the pen cursor shakes, jumps and drops out, mouse works fine.
It is very likely that it is something mechanically wrong with the tablet. It's like the screen isn't registering the pen input correctly.
Also tried turning off pen pressure and tilt
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