Hi Dinil, I re-checked and there were two mapped so I deleted one. Also, if you are entering more of these, the phone format for Australia is +61 3 9902 6011 and I have fixed it.
https://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines/Australian_features#Phone_Numbers

I see quite a few people entering two defibrillators instead of one and have wondered why. I expect they expect to see a defibrillator icon on there map but the the standard map on osm doesn't render them yet so some mappers might think they haven't mapped it properly. Maybe they get a double subsidy for the extra one. Who knows? 