Devices Stay Online Even When Battery Taken Out

Hey SimpliSafe-

Need help here because replacing the base station didn’t fix this odd issue I’m having:

Im able to take the batteries out of my different sensors - yet my app says they are still connected to my base station and battery levels are good - days after the batteries are removed.  

So why are they still showing as connected even when there is no power to them?  I’ve taken the batteries out of seven different sensors now and even the keypad and there is no message that they have been disconnected. They all showed as connected even after 24 hours. 

Any insight would be helpful here as it is pretty bizarre!