I move any BIG 8, but display shows always a different BIG 8 active

Possible causes:

• If your Big 8 slitter does have only one long magnetic rod-sensor, Big 8 cutting heads shall not touch each other, because the magnetic positioning rings (sitting around magnetic rod-sensor and mounted in each Big 8 unit), could interfear each other.
• The amount of Big 8 units must always be equal with the amount of Big 8 icons shown on the display.