Double 3 Way Switch Wiring Diagram. The diagram below will give you a better understanding how this circuit is wired. The green looking wire is actually blue.
I picked up a lot of good advice from various posts - enough to put together a wiring diagram. The red wire in the cable is known as the traveler, and it connects to the black terminal screws on the pair of switches. Right now, each switch is functioning like a single pole, turning on/off the string of outlets rather than controlling the outlets as intended.
Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the top and bottom of a flight of stairs or at two different entrances to a room.
NOTE: This diagram is a thumbnail.
A DPDT panel mount switch with preattached polarity reversing bars. You'll notice we now have travelers. The green looking wire is actually blue.