I am confused as channel 430 is BT Sport 1 HD on my Youview box. Lifetime HD is on 384.
I've had the same problem a few times, and if I remember correctly if you look at your recordings it only shows one. I think it's recording both SD/HD versions, I found this by scrolling through the guide.
I've no idea why it happens, it may be a series link issue.
I was on channel 101, trying to switch to channel 430 - but - YouView was telling me that there was 2 recordings taking place on channel 384 Lifetime HD. So woudln't let me withotu cancelling one of them. Anywhere else on YouView box, only 1 recording was taking palce.
It makes even less sense this way! Haa!