Double Fibaro Switch - The double-button doesn't work properly

Hello,
I’ve included the Fibaro relay switch 2*1 in the Vera.
I have 3 switch-buttons - left, right and double.
The right and left buttons work properly, but the double-button controls just the left light switch.
I’ve read that the default of this button is to control both of the light switches, , but I tried to change the parameters to default anyway:
‘variable’ - 1, ‘data size’ - 1 byte dec, ‘value’ - 0 (I’ve also tried 255),
and it still turns on/off only the left light.

I’ll be happy to hear any suggestions.
Thank you very much,
Ori.