There are multiple SmartHome Skills available which work with the Philips hue lights. It can be that our lights have been discovered by multiple skills ( e.g. yonomi, Wink etc.) and as such, they will be duplicated in the list. In the devices list you can see which skill the device is linked to, e.g. Kitchen Light connected via Philips Hue. Decide which Skill you want to use to control that light and "forget" the Smarthome devices you do not want to use.