photos App: Places not showing all the pics

I have location information in my pics, but only a very few appear on the map when you click PLACES.

I have taken pics in different countries, in the photo info, it has the location information, but when i view the pics through the PLACES link, most are not shown.

If i look via the PEOPLE link and view the map, then pics are placed on the map, but not if I go directly to the PLACES link. View few pics are shown on the map

Any ideas how to fix this?