Disappearing series recordings - Digital Box (2)

Hi Optik-Kate so another issue, different than the usual, but linked to Series Recordings so i'll post it here:

So I have a Series Recording set for a series called "Silent Witness" which air's on CH375: BBC First, has been on every Thursday starting @ 18:00. It's a series where the weekly programs are aired 60 minutes long, Part 1 at 18:00 immediately followed by Part 2 @ 17:00, set on New & Repeats.

Now, the Series Recording is still showing in my list, so not disappeared this time, but it's not recording both parts?

The guide shows it's next airing is upcoming on Sept 21, Ch139: BBC First, (Silent Witness) 18:00 - S23:E3 (titled) "Close To Home - Part 1" and following @ 19:00 - S23:E4 "Close To Home - Part 2". 

In my upcoming recordings for that Series it has scheduled on Sept 21, 19:00 S23:E4 "Close To Home - Part 2" as recording but bizarrely it's not recording the previous part @18:00 - S23:E3 (titled) "Close To Home - Part 1"? I have had to set a single recording for that missing episode.

I'm unable to see what it's going to do on the 28th Sept because the guide doesn't list that far in advance.