I have a problem with my Calendar on my Mac OSX 10.9.5. I normally double click on any date and create a new event. I give it an appropriate name and the correct time and after 2 to 5 seconds some of my settings are reset to the default value. So the time is set again to all day event, or the title is set to "New Event" or other things are just lost.
These are all iCloud calendars. It looks a little bit like the sync with the cloud is not working properly. Like on double click it creates an event and sync it to iCloud. After my edits, it doesn't get synced into the cloud, but after a few seconds it gets the already since event (with default settings) from the iCloud and overwrites my changes to the event. (not sure if this is really the case, it is just my theory)
I search this community already and found a similar problem which was closed due to low quality answers but in the end, there was no suggestion at all. (similar article)
So my work around is do just one step at the time, changing time, name, etc, but even this is not always working and it is really annoying.
On my iphone, everything works fine without an issue.
Thanks in advance for any hints tips and tricks.