need some help on my wiring

[pissonNOS]

well what i was trying to accomplish was to have one seperate switch that would allow me to drop all 4 bags at once in stead of seperately. So I wired it how I thought it should be done but no even when I push the individual switches all 4 valves are activated. What I did was use my existing wires on the individual switches but just wired 2 in each connection ( if that makes any sense) and for power I tied into what Im already using for the switches. What did I do wrong? should I be using another power source? and was wiring them into each other the problem?