icloud.com missing calendar events

I have an iPhone 6 S Plus updated to iOS 12.1. I also run Outlook AddIn on my PC desktop. I also run a second Calendar app called Calendar. My Outlook, Calendar app and iPhone calendar are all syncing. The iCloud.com calendar is missing hundreds of events, past, present and future. I have tried unsubscribing and resubscribing, removing the iCloud addin in Outlook, clearing my browser, trying different browsers. I can add an event on the icloud.com calendar and it syncs across all the apps. I've done research, but haven't come across any solutions.