Q: Why does my iCloud calendar have multiples of every event?

I have my Outlook calendar set to sync to iCloud. My iCloud calendar has double, triples, sometimes even more instances of the same event. This is true for every event on the calendar. When I look at the local calendar on Outlook, there is only one instance of each event. How do I stop this from happening? I am getting tons of event reminders popping up on my phone, super annoying.