Not quite.
Button 1 pressed > turn off all other LEDs, turn on LED 1
Button 2 pressed > turn off all other LEDs, turn on LED 2
Button 3 pressed > turn off all other LEDs, turn on LED 3
Button 3 pressed while LED 3 is on > turn off LED 3
...
If the button associated with an LED is pressed while the LED is on, the LED should be turned off.
Pressing any button turns off all other LEDs and turns on the one associated with the button.