If you're seeing two separate wifi networks on your devices after setting up Milo, it means one of two things.
What's most likely is that you opted to set up Milo without the app. This will always create two separate networks: the network name found on the bottom of your Milo, as well as the original network associated with your router. There's no problem with this set-up - but if you want to consolidate your networks into just one, you can download the app, create an account, and there you can change your Milo network name and password to match your router network name and password. This will combine the two into one network. What's more, you can set up your Milo base wirelessly from your router.
If you set up Milo with the app or tried to combine the networks, it's possible that you either made a typo when entering your existing network name, or entered a different name. This creates two separate networks, but each works fine. To fix it, you can change the network name on the Milo app, making sure it's identical to your router-associated network name. This combines the two networks into one single network, powered by Milo.