Sorry, I'm on mobile and didn't notice. I'm not sure if *any* water changes the graphic, or if only when *full* of water. I filled mine from barrel and I know they're full. Is it possible you filled from flask or something else and they are not completely full?
You don't need to water Mound Bed for it to work. Watering is only required for herb planting. Proof: Mound beds added: viewtopic.php?f=39&t=73946 Later they added ability to watering them in order to plant herbs: viewtopic.php?f=39&t=73978