iCloud calendar syncing but events not syncing

I have an issue wherein my iCloud calendars on my Mac are syncing with iCloud, but certain events on the calendars aren't syncing. I imported a calendar from a file that has my school class schedule, so now on my computer I have my class schedule and can make alerts on it and that kind of thing, but the repeating events that stand for the classes aren't syncing with iCloud. I tried creating test events in that particular calendar, and they synced fine, but the class events are refusing to sync. Any help?