The ABC's online TV Guide for Melbourne has -
Adam Hills: The Last Leg
Wednesday, 20 Dec
Series 12 | Episode 12 | Jon Hamm & Rag'n'bone Man
10:30 PM - 11:10 PM [40 mins]
as does Our Guide (Melbourne) listing -
Adam Hills: The Last Leg
Wednesday 20th December at 10:30 pm (40 minutes)
Your timers show a program start time and a duration change. I'm guessing you've timer padding of 9/30 mins pre/post.
If the above guides are accurate, then it would appear you first received two different timers from IceTV both for a 22:20 start and 45 min duration. These timers weren't deleted when the subsequent timer for the 22:30 start, 40 min duration program event arrived.
Perhaps IceTV never sent the 'action/forget' messages for the original scheduling (or the T4 didn't/couldn't action it)
I'm guessing the T-series doesn't start a second recording if the key timer attributes are the same (start, duration, service, location?).