eSphere presence sensors are designed for single-SSID networks. With separate 2.4, 5 and 6 GHz SSIDs, the sensor joins the 2.4 GHz network and still detects presence devices on 5 and 6 GHz. Network-isolation features (guest networks, VLANs, client isolation or separate subnets) may reduce accuracy or prevent detection. See Split-Band Network Setups.
This is a characteristic of eSphere as currently designed. It is not a defect and is not scheduled for correction.