I'm completely new to GIS and this is a very basic question about editing existing shapefiles.
I am working off an existing shapefile which was digitized (by a colleague) so that polygons represent building cover. The shapefile contains information about the land use type and area. I am using QGIS to edit the shapefile.
Now, I wish to add/remove/edit polygons to improve accuracy as the extent of building area has changed a lot recently.
However, when I add new polygons into the shapefile (by digitizing it using an updated basemap), they are not added into the same polygon class as the earlier shapefiles, even though I input the right LandUse type (i.e. Buildings) in the attribute form. Each new polygon seems to create a new LandUse category, even though they're all namd "Buildings".
How do I ensure that any new polygons I add are added into the same LandUse class (all previously created polygons are in this "Buildings" class)?
Here's the attribute table
And here's an image of the map. The light pink polygons are the new ones I've added. And the dark pink ones with the red outlines are from the old dataset.