They like doing that with the Repair Shop too in the afternoon, they announce a new series but only 3 of the 5 daily shows are new with the other 2 in between being repeats from past series with a different CRID.The BBC are also prone to doing this, in the past I have seen 3 or 4 diffeernet series CRIDs for Homes under Hammer in the same week though at the moment, touch wood, they appear to be using a single series CRID and showing episodes in order!
During Lockdown when Glastonbury was cancelled, they showed programmes from previous years and every one had the option to 'Record series' but every one had a different CRID so you couldnt actually use the series recording!
