Run attached sample and move path to top of scene(with mouse drag).

See attached screenshots for original path and path after translation.

This bug appears on paths like this one:

        final Path path = new Path(
                new MoveTo(50, 150),
                new CubicCurveTo(0, 0, 100, 0, 50, 150),
                new ClosePath()
        );
        path.setStrokeLineJoin(StrokeLineJoin.MITER);
        path.setStrokeMiterLimit(10.0);
        path.setStrokeWidth(30);

If path beginning and ending points are not equal, all works perfect.