Same here!! I have a few.
No good deleting them either, they will come back!
Fester's issues appear to be phantom schedules in My Week that comes from timers on the recorder overlapping into the preceding or following timeslot in the guide.
Those phantom single recording schedules in My Week should not be extra timers on the T3. The real schedules following those single phantom schedules would be set to start early so they overlap into the preceding timeslot making the show before the real schedules appear as if it is also scheduled.
Because they are not real schedules in My Week you cannot delete them in My Week, or if you can they would just reappear the next time the T3 syncs.
If you cancel the real series schedules that are following those phantom single schedules on the same channel, then both the real schedules and phantom single schedules will vanish. Then when you recreate the real schedule the phantom schedules will still be gone.
Just cancel the following episode, then do a fetch from the IceTV plugin on the T3, next set those cancelled episodes to record again and do another fetch on the T3.