Even with that as you can see above, all 3 bulbs were still on even with the group dimmer switch off 
With verifying it with your example, do you mean to turn on a bulb individually and see if they all turn on / the switch turns on ?
Yeah - all the yeelights have static IP addresses / no hub between them.
*turning one bulb on, turns the switch on, and turning that one bulb off turns the switch off
