App Maps can’t add home

1. On Apple Maps, click your icon.
2. Choose favorites.
3. If the Home address shows, then click the information icon. If it doesn’t, go to step 5.
4. Click the blue Contact Card button, edit your Contact, and replace your old address with your new one, or add a new address labeled home. Go to step 8.
5. Click +.
6. Type and add your address.
7. Under “Type”, click Home, and add it.
8. To access it, type home in the Maps search.

Go to If Maps isn't working on your Apple device - Apple Support. This is weird. Also, change your home address in the Contacts app.

And also subtract any extra home addresses using the red minus.