Welcome to OSM!  
Your edits seems to look okay to me.
The map you see on the main page is called a 'rendered' map, and when you edit - you edit the source data which is a vector map.  It can take a while for the vector map to get translated to the rendered map -- and the rendered map can take a while for caches to get updated for you to see.  So wait a little while, could be a few days, refresh, etc. and it should show up.  I suppose I've used the system enough to trust that it will eventually update, but I suppose it took a while...

I've noticed that if you make a lot of edits in the same region it can take longer for later edits to render, so it's best to not wait for the renderer if possible, stick things related together, and expect the lower zooms to take a long long time to get rendered and pushed through the caching system.  Patience is a virtue!