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events show up twice

events show up on my calendar twice when added from my phone. when I add them from my caldav calendar events only show up once. I tried uninstalling and reinstalling the app. also, I set up a phone for my daughter using the exact same calendar service, exact same model of phone, exact same version of one calendar, exact same version of Android down to build number. the only difference is the actual account being used to sign in. for some reason though, on my daughter's phone when she adds an event in one calendar it only shows up one time. it shows up twice in my phone now. I can't figure out how to fix this.