公園は異なるが50mしか離れてない場合は申し立てでも重複されるんですね。
What is this in regards to?
I am assuming his nomination in apartment complex have 2 park and it got marked as duplicate
If its clearly separated, you can try appeal
Assuming both park have their own anchor, it might be possible to nominate them separately. I cant see full detail on the park but it look like very small park