This past week I've had a few duplicate episode recordings for passes that I have set to "New episodes", the second airing is on a different channel hours apart (e.g. last night 9PM and subsequent airing at 2AM). Normally Channels does a perfect job of not recording duplicates, in the UK for example we have HD and SD equivalent channels, and often another channel that's repeated with an hour delay, only the HD recording is scheduled and the SD/delayed airing is ignored.
What's potentially different about this is that it's happening at a completely different time on a different channel. I'm unsure if this is a scheduling change that's highlighted a bug, or if there's a recent regression in the DVR.