This now happens about 90% of the time I attempt to draw the donor glyph. As soon as I start the loop, the cursor gets pulled to the outer edges of the screen and continues to drift on its own making it literally impossible to draw the glyph.

Do you have a spare mouse that you might be able to try and use? This way you can check if the problem persists between them. Also, have you tried updating your mouse drivers?

Old thread,but haven´t seen anyone solve it yet, so here I go. Each time I try to draw(both in the world map as in the level map) the game seems to start lagging and it looks as if someone else is moving the mouse or simply drawing becomes not manegeable.

Look here: https://www.pcgamingwiki.com/wiki/The_Void

I also suggest try turning off 'enhace pointer precision' in mouse settings in the control centre (Windows). It is a tick box.