"Drawing is the root of everything" ~Van Gogh
It's too sweet for me, it looks: "Come and eat me!" The fruits are juicy, a very good ... and dangerous draw!
yes its a bug. did you create the pic using the old tool?
you can fix it editing the pic in the new tool, then choose the eraser tool and click on the wrong shading. then save. done.
The shading on the right wasn't there when I made this , must be some bug, because it isn't visible on the thumbnail...