Curve tool making closed shapes instead of lines?

Bit worried this is a stupid question, but anyway.

Using the curve tool is supposed to be like:
Click for one end, click for the other end, click to change the curve.
But what I’m actually getting is:
One click sets both ends of the line to the same spot, the click just warp the shape it’s made. And I only get three clicks before I can’t change the line anymore.

If something’s gone wrong, or if I’ve just enabled something I didn’t know about… I can’t find anything about this on Google, so I got nothing.

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The curve tool needs you to click and drag to create the first line, not just click.