This happens because the tail rotor doesn't have enough power (speed) to control the tail. Having a pitch curve without very much negative pitch makes it worse because the model gets light on the skids before the tail rotor speed gets high enough to control the tail.

If you are just learning, there isn't really much you can do about this except fly off grass or use good skid stops on smooth surfaces. Raise the throttle very slowly so the head spins up smoothly.

Once your skill improves, put more negative in your Normal pitch curve and make the throttle come up a little faster.

The main thing is to know why it's happening and being ready for it.

When I try to lift off, the model spins around then seems normal.

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