After import CSV calender in SharedMailbox only I can see all items


I'v imported a CSV file with Calendaritems in a SharedMailbox Calendar in Outlook.

File > Open > import/export

Works fine, but only I can see all the items, not all others.


When deleting the calendar in my Outlook and then add the calender again, no items show up.
What's going on? 

Please some help. Thanks

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