Odd. We record that on the freesat box and that has picked up the Tues 6th programme without me doing anything to the series schedule.
This series has been different in that the XL has been the primary version on Fridays (? I think) with the shorter one shown early the following week. According to RT, for next week at least, the XL is Tues as you noticed with the shorter "revised repeat" on the following Friday. There doesn't appear to be any QI of any flavour this coming Thurs or Fri. I can't see anything like football to cause a bump, so I wonder what they are thinking.