why does my .me online calendar not match my iCal on my desktop?

Not only do my calendars not seem to be syncing up, my iCal at home has double events for every repeating event. But more annoyingly my .me calendar is different than my ical at home calendar. Arent all these calendars supposed to sync up? If i make a change on my home iCal shouldnt it change online too? the double events are very annoying too..