Because CH5 are using the same series recording crid for the same programme on different channels this is what is happening to a series lunchtime recording of Home and Away.
Say you set a series recording now for the lunchtime show.
This gets recorded and after this the box looks for the next episode, it finds this on 5* so the recording now schedules this one instead of tommorows lunchtime showing. They need staff who understand how the codes are supposed to work. In this case all they need to do is give each channel a different series crid.
I have converted my series recording to manual weekday repeating ones to get over the problem.