Artistic Media strokes don't line up with the control lines... why?

When I make my own custom artistic media strokes and try to draw with them, the A.M. stroke is offset from its control line. (see screenshot below) I don't seem to notice this so much in the strokes that come with CorelDraw.

I try to make my shapes as straight as I can and with as few nodes as possible, but they still don't line up when turned into a brush. And when I fill the shapes, there are gaps between the end of the strokes and the filled areas, even though the control lines form a closed shape.

I want the ends of the artistic media stroke to line up with one another and for the stroke to be centered along the control line.

Are there any tricks to creating better strokes, or is this just a limitation of CorelDraw itself?

Thanks!