Hello.
Thank you for the Node tool tip.
I didn't use grid mode. Unfortunately I can't provide screen shot of Snapping settings, because I tried so many different settings (object creation, curve drawing, at one point I had all the options selected including snap to grid, guides etc.). When I drew the shapes, they "snapped", but yet resulted "close" as can be seen in your Node tool tip example.
I redrew the lines using snapping manager. Outline view seems to be correct (zoom view size +1700 %) but colour mode shows white outlines. I haven't used any outlines in my objects. Last screen shot is 100 % view.