I have set Elementary for series recording (all episodes) on 2x 7100+. The last two Sunday nights an episode has been scheduled to record (on TEN). After the timer downloaded IceTV updated EPG data to remove Elementary from the schedule but the timer remained in place.
I have also recently had two or three instances where the scheduled time for a program has changed, and the old timer has not been deleted and a second timer has been added. In each case both recorded. I think these instances were on a 2400. One program was on a Seven Network and the other on Nine Network.