Mysterious Guest Network

Yes I am using the guest network. The main reason I unchecked Broadcast SSID was while I was logging on to my guest network which is used for an outdoor wifi security and camera system and pool equipment as not to use my primary network was the first time I noticed the network appeared and it was unsecure, it actually show devices on my primary wifi network so I kept the name as not to have to reset all of my wifi security devices then created a hidden network with the same name.

If I uncheck Guest Network and just leave the name of the hidden network in the blank the guest network goes off line. I have not tried unchecking guest network and rebooting all four of my satellites. Trying that or a total factory reset might help the bigger problem is that this phantom or mystery network seems to come and go and it's unsecure as if sharing is turned on and it also sees my devices on my primary network. Currently I am not seeing it but it was there this morning. Rebooting the main router did make it go away but I'm afraid it will be back and  my shared devices/files will be unsecure again. Very strange a network created by the Orbi which is called ORBI27-GUEST can see devices in the primary network.