Calendar Event not updating as it should

A calendar event that no longer exists is stuck on my Niagara calendar, I’m not sure why this is, I have tried restarting Niagara launcher and reinstalling the app, I have also tried adding a new event to the calendar and it did appear in my Niagara calendar, so it doesn't seem like an updating issue. Basically there is a ghost event that won’t dissapear no matter what I do.