Fibaro FGS-221 and FGS-223

If you are using a C7 hub, then you are doing nothing wrong.
There are some issues with Z-Wave which will hopefully be resolved shortly.
See the thread below.
If you are not using both switches, change the device drive to the in built 'Fibaro Switch' and hopefully it will work for you. Just as a temporary measure.
I'm having exactly the same issue with my 223's and also issues with most of my Fibaro devices on the C7. Working brilliantly of my C3 and C5.