I have this scenario but have a total of 15 LED's and 15 switches. I am getting shorts across my open switches. I can disconnect the power supply from the circuit and the short goes away. These shorts are causing some LED's to light when it is unwanted. I have tried moving the individual resistors to a common resistor and putting a RL257 diode in place of resistors. The power supply with all output wiring removed shows dead short between positive and negative. Link to power supply. Any ideas on how to isolate the legs of circuits would be greatly appreciated. This is a small part of locking control system for a small prison. This shows on the control board if the door is open or not. I tried to keep it simple for ease of repair and less points of failure.
Thanks
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