Hi – sorry to hear you hit difficulties (but great you worked around them 🙂 ).
There is definitely a problem where all but one event in a series is trashed and I’ve logged it for further attention. If this does crop up in the future, you might find it easier to hit Edit Single on the last remaining event which will break it out of the chain of events (and so it should no longer appear as recurring on the frontend).
That said, I definitely get your point that it makes no sense to display a “Recurring Event (See All)” message in this scenario and hopefully we’ll be able to do something about that shortly.
Please note though that our very next maintenance release is literally in the final stages of preparation so we will probably be unable to squeeze a fix for this problem into the same release – but we’ll certainly look at it shortly thereafter.
Thanks for reporting this 🙂