appointments created on IOS are not shown in Kolab

[Benedikt Schäfer]

Hey,

when i create an appointment on my iPhone calender the appointment never 
appears in Kolab (Rouncube), but when i create an appointment in 
Rouncube the appointment is synced with my iPhone Calender. When i make 
changes in existing appointments on my iPhone they are perfectly synced 
to Rouncube, only newly created appointments on my iPhone are not synced 
to Rouncube.
Where should i start looking to fix this issue?

Everything is up to date.

Greetings,
Benedikt Schäfer