Check if the Calendar sync feature is enabled on your devices. You should also check if auto sync is enabled on both your Samsung and Google accounts. It's possible that the event was added to multiple accounts, and that is why the event is showing up multiple times.
Navigate to and open Settings, then tap Accounts and backup, and then tap Manage accounts. Tap the switch next to Auto sync data to enable the option.
Next, select your Samsung account, then tap Sync account, and then tap the switch next to Calendar to manually enable syncing. This may speed up the syncing process.
Events can be synced to your phone or tablet from other devices that have the same accounts registered. For example, you might also use Outlook on your computer. To get rid of the event, you can delete the event from the original source.
You can also check the app’s settings. Navigate to and open Settings, then tap Apps, and then tap Calendar. Tap Calendar settings, then swipe to and tap Manage calendars, and then check the accounts that are currently synced to the app. You can enable or disable syncing by tapping the switch(es) next to the accounts.
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