Scheduled Admin Events in Calendar no leaping properly

My scheduled Admin and 'Your event' and added an extra day.
Therefore a Thursday Event went to Friday.

The Monday one I deleted and readded it after Feb 29th.

I think the problem is related to Daylight Savings Time - that changes on 8 March. If recurring events aren't registered for a specific time, the system (which is a 3rd party add in) seems to add 24 hours x days to midnight on the first occurrence. I haven't ever tried (we don't have DST), but if you use the Week option at the top of the screen instead of the default Month, and enter the event against the actual time, it might adjust correctly.