In some cases you may end up with duplicate places in Momento. To resolve this you can merge the places together.
To merge people, navigate to the 'Places' screen inside the 'Explore' tab and tap the place you wish to merge.
Tap the '•••' button in the top right and choose 'Merge Place'.
Select the person you would like merge into from the list which is displayed and tap 'Next'. You will then be presented with the 'Merge Screen'.
From here you can see an overview of location, name and address of both places. Choose which location, name and address details should be used and then hit 'Done'. This operation cannot be reversed so please complete this with care.