I’ve just added Chapman’s Green in London N22 and it all looks okay when I save and it appears in search just fine, but the name doesn’t show on the map and it hasn’t blocked the area in green.
Not to worry, looks fine to me. This is usually caused by your browser caching the old tiles. A Shift-F5 should force the cache to be cleared. Another approach is to toggle to the Humanitarian layer which because it has a less complex stylesheet usually refreshes after a chance a bit faster (but you may have to zoom in/out to cause tiles to render at all).