It looks like it's actually shown three times! I think this is because there are three different relations with the name "Whitelee Forest":

* https://www.openstreetmap.org/relation/13116389
* https://www.openstreetmap.org/relation/13116390
* https://www.openstreetmap.org/relation/13116391

I'm not completely sure what the best solution is here. Probably those three relations shouldn't each have the name "Whitelee Forest", as none of them actually represent the whole forest. One option would be to create a super-relation that contains the three relations hand give that the name "Whitelee Forest". Although arguably "Whitelee Forest" isn't just the wooded areas, and actually includes the rides between the trees too. So perhaps we need another OSM object for the boundary of the area known as "Whitelee Forest", which then carries the name.