Scheduling of Brainiac

The sixth series has been running for a few weeks now. It started on Sky One on Sundays. However, I set a series link on this, and missed last weeks. This is because they moved the show onto Sky Two. With Sky One now promoting the show for Fridays, I thought that it would repeat what was shown on Sky Two. It wasn't. Infact, the shows on Sky One and Sky Two are completely new but completely different. Why are Sky doing this, or is it the fact that I've not realised they are repeated?

I've not looked at the schedules but I would find it highly unlikely that the first showing would be on Sky Two with a repeat on Sky One.

Are you sure the show you caught on Sky Two wasn't the previous Friday's Sky One show (the one you missed)?

That's what I have in mind but when they started promoting it on Fridays instead of Sundays, I was rather confused.