It sounds like the apps were unpinned, but not uninstalled. Sweep up slightly at the bottom of the Start screen, select 'All apps' in the right corner of the bar at the bottom. That will show you all the apps installed on the Surface. Touch the Tile for a few seconds and pull down slightly on the Tile, an uninstall option will be on the bottom bar, the app to be uninstalled should have a checkmark on it. Select Uninstall.