When you create an event which takes longer than the recurrency you set for it, then SOGo should give an error message.

At the moment you have the following behaviour:
A) Create an event which takes longer than one day and set recurrency to "daily" ==> This event will pile up after the first day.

B) Create an event which takes longer than a week and set recurrency to "weekly" ==> This event will completely vanish!!

C) Create an event which takes longer than 2 weeks and set recurrency to "bi-weekly" ==> This event will completely vanish!!

D) Create an event which takes longer than a week and set recurrency to "Every Weekday" ==> This event will pile up after the first week.

E) Create an event which takes longer than a month and set recurrency to "Monthly" ==> This event will completely vanish!!

F) Create an event which takes longer than a year and set recurrency to "Yearly" ==> This event will completely vanish!!

That's not what you expect.
It should give an error message like "You have choosen a too short repeating interval for your event duration. Please shorten your event or enlarge your repeating interval."
After that you should be able to correct your settings for this event.