(Some of this answer also applies to looms with a Toika ES computer controlled dobby.)
Symptom: when treadling for a pick, extra shafts rise (or in some cases fall) unexpectedly.
Possible causes:
(1) You have threaded a warp end through a heddle on more than one shaft. Each warp end should pass through just one heddle.
(2) Your unused heddles are bunched together and are lifting an adjacent shaft.
(3) Your arrow pegs are snagging the Texsolv cord on an adjacent shaft and moving it too.
(4) You have made a mistake in your treadle tie-up. Check which lamms move when you treadle.
(5) The arrow pegs on your Texsolv cord are jamming between lamms and making them move together. If you are using the top-of-the-lamms tie up technique we recommend knotting the top end of each cord rather than using an arrow peg to stop it falling through the lamm hole.
(6) ES looms only – check that the number of shafts for your ES unit is correctly set in the software – ES-16, ES-24 or ES-32.