Hi
Welcome to OSM
Creating individual platforms so they can be numbered improves the map, but instead of overlaying new platform polygons over existing, which doubles-up the overall number, could you please edit the existing by splitting them. There's instructions in the id editor on how to perform that. I note you've made a few changesets which you need to amend. 

Could you also add 'area=yes' to them as there's a bug in the main rendering program.