Hi,
there's a problem with the way you edited data here:

I guess you downloaded a geojson file, loaded it in JOSM and edited & uploaded it again?

This doesn't work, because JOSM can't edit the original object (it's missing the id of it). Instead it creates new duplicate objects.

E.g. this POI:
https://www.openstreetmap.org/node/11875307690
is a duplicate of the older
https://www.openstreetmap.org/node/4672118481

Right now there are about 1200 duplicated POI that need to be reverted:

http://overpass-turbo.eu/?R&Q=%5Bout%3Ajson%5D%3B%28node%5B%22%40timestamp%22%5D%3Bway%5B%22%40timestamp%22%5D%3B%3E%3Brel%5B%22%40timestamp%22%5D%3B%29%3Bout%20meta%3B

Please let me know if you need help with that!

Jan