I had this issue for a while, but it never got resolved. I'm not sure if others also face the same issue or if it's just me. Every time I log in, or move to underworld (La Hai Roi) or overworld, this Fleurdelys echo node appears. I tried marking it one time, but it still pops up after I teleport back to the same level. (e.g. after I mark it when I'm in La Hai Roi, and then teleport to overworld, then back to La Hai Roi)