You connected the COMMON conductor to the wrong screw either in one of the switches or both of the switches.
Look at your switches when two switches are used to control one device [receptacle or light] then you will find three screws on each switch device. This is called a three way switch device. Look at those three screws you will find one screw to be a different color than the other two screws. The two screws that are the same color are called travelers. The one screw that is of a different color [most often black headed screw] is called the COMMON screw. This common screw is supposed to be connected to the COMMON conductor.
Now the problem is finding which wire was the COMMON conductor.
Look in your switch box and see if you have a black, red, and white wire and a bare wire to connect to the switch that is not wire nutted. If this is what you have then try connecting the black wire to the odd colored screw and the red and white wire to the two screws of the same matching color as each other. Then connect that bare or green wire to the green screw of the switch.
Do the above mentioned in both switch boxes. Try your switches again and see if problem solved.
If you have wires such as two blacks and one red wire to connect to the switch then look for the one black that comes from a different cable sheath than the other black and red wires. The black and red wires that come from the same romex cable sheath should be connected to the two screws of matching color. The black wire coming from the different cable should connect to the odd colored screw of the switch.
Again do the same in the second switch and test to see if this makes your switches work right.
Let us know what you find or if you have something different than matches the discriptions above.
Good Luck
Wg
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