Time changed on events after end of B S T

all event times that are part of a series have moved back 1 hour on the display... why? there is no reason for this, just because the clocks went back does not then change the times of everything... and to make matters worse I can't edit the full series altogether, I need to either do it individually or delete the series and then enter it again after the time change... I have many recurring events that took me quite a while to input that I'm now going to have to delete and enter again... pointless feature!