When working with the curvature tool, the anchor points delete themselves. This seems to be happening when I alt+click on one to make a sharp corner, then go to place the next point, the previous point (sometime the two previous) will delete themselves and end the path, as if I'd finished and gone to another tool (for instance the direct select tool) when I have not and am still trying to draw the path with the curvature tool.

Latest Version of Ai CC(just updated yesterday), Windows 10 (also latest update)