CRM Online Outlook Appoinments Syncronization Problem

Hi everyone!

I create plugin that create birthday appointments. Everything works fine in CRM Online (8.1.0.526), but not in Outlook Online. For example, plugin creates 7 apointments (fig 1), but when sync with Outlook there are more than 1000 in there (fig 2). I checked there are just 7 in CRM, plugin works fine. Can somebody help me with it? 

Fig 1

Fig 2