We have two station power pack which is used for job clamping in CNC machines. From one station we are operating 4 clamping cylinder. We have pressure switch to get clamping feedback. When we operate other station, pressure switch from the first station goes. Why?

In one station we have 1. Directional control calve
2. pressure reducing valve
3. Pilot operated check valve
4. flow control valve
5. pressure switch.

We have two station like this, each station operates 4 cylinder.