I'm not able to reproduce this on my local machine, can you try and reproduce it on the demo site so I can see it?
I can say that it is important that you set the time zone in the event Calendar Pro settings before creating the event and also make sure the time zone in your user profile and the default time zone in Site Settings are correct before editing the event. We are storing the date/time in the database as utc and then adjusting it for the time zone for display, but that means that at edit time we must be able to correctly calculate the utc time based on adapting from the time zone of the event calendar. Then assuming that is correct, in Feed Manager it will be adjusted according to the user profile time zone or for unauthenticated users it will use the site default time zone.
It is also important that the time on the server is correct though it doesn't matter what time zone the server is configured for only that the time is correct for whatever time zone it is using.
Hope that helps,