For your scores to show up in the app, they have to be in the Apps>Notion Mobile folder. This should not be a folder that you created. This folder should be created by the Notion for iOS app, when you sync it to DropBox. If you created the "Notion Mobile" folder, that might be the issue. Try removing that folder and use the folder that Notion for iOS creates in DropBox. Apps>Notion Mobile. You may want to try removing and re-installing DropBox if the problem persists.