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I deleted a meeting from my calendar, but the alarm still went off at the original time. The same thing happens when I move an event to a different time or rename it — the old alarm stays registered. The only workaround I found is to open the app and let it resync.
Thank you for reporting this. Alarms were only rebuilt when the app was opened, so a deleted or moved event kept its old alarm registered in the meantime. Version 1.4 watches for calendar changes and compares the scheduled alarm against your next event, resyncing whenever the two disagree — including renames. You should no longer need to open the app to fix it.