try pushing the middle one to lock the susp at its road height the other two should go out. Let it stabilise then release the middle button.
 
On mine sometimes one or other of the lights come on as it adjusts itself. I did notice once when parked that all three came on. All I did was press them all in turn till they went out! As long as its going up an down as it should I wouldnt worry too much- might be an electrickery issue.....
 

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