Hi Woodpeck, 

Felix asked me to respond because he is not a native English speaker. 
The area has tremendously changed the past year a lot of people have fled the region into the city of Goma. In 2023 there was large population movements, and now the past couple of months again. Read here more about the situation: https://www.thenewhumanitarian.org/news-feature/2024/04/04/crowded-camps-and-local-aid-how-dr-congos-m23-conflict-impacting-goma
This means as well that a lot of the shelters that were mapped in 2023, have thus indeed changed/replaced by other buildings now, and it thus makes sense for buildings to be deleted and remapped. 

Please take into account as well that Felix is not an English speaker, and that he is only a new mapper, so that he certainly can use help and explanations on how things work within OpenStreetMap! So feel free to share links, information (preferably in French) that might help him and the group of students in Goma that he is working with.  I've personally been giving training to the local group of students in  Goma who has been mapping the new camps, but please do give them some credit and learning time. 