It's confirmed, the upcoming release of iOS 8.2, which is now in Gold Master release fixes the GMT calendar bug which has affected so many members.It looks as if you've run afoul of what I call the "GMT Bug." Please see this thread for more info: http://www.ipadforums.net/threads/something-on-the-net-forcing-gmt-on-calendar-entries.126073/
I have heard that iOS 8.2 fixes the issue but for now, we're kind of stuck with either living with it or using another calendar. Sorry.
Marilyn