My Phone appears twice on Device Manager, however one is wireless and one is wired?

[thisisreallife]

I've noticed with all 3 phones in my house, they all appear twice under Device Manager. However one says wired and one says wireless. The wireless is obviously the correct one because it has IP Address and says it's online, the wired one has no IP address and says its offline. 

What's strange is that if I delete the wired one, it will reappear after a few minutes. 

All the phones we are using are Google Pixels..if that makes a difference.

I've noticed that they both have two different MAC Addresses also.

Any idea why this is happening? I would like to just have one under the Device Manager if possible. 

 

I have attached a image

[Netduma Fraser]

I think this is probably due to the 'Randomised Mac Address' option on the phones, as they get a different MAC address the router sees them as an additional device. Do the following on each device to remove the additional devices and only have the one showing going forward.

1. Open your phone's Settings app.
2. Tap Network and Internet  Internet.
3. Next to the network, tap Settings .
4. Scroll down to 'Randomised MAC address' and disable.

Then reboot the router from the interface, wait 2 minutes, then click the  icon on the Device Manager page, click remove offline devices.