I was adding new programmes/series links to my record list today, and checked them on the page for "My planned recordings".
I noticed a small blue button above the list that I had not noticed before. Pressing blue toggles through recordings that clash and all planned recordings/programmes that clash or not.
There was a huge list of clashes! Reading through them it was obvious that TIVO was trying to record not only the NEW shows I required, but REPEATS and OLD series too.
I went through my series link options, and I had set the option to NEW only as I require.
Glitch or bug? Or have I made an error somewhere?
I also realised that accidentally trying to add a 4th programme at the same time/date does not throw up a CLASH warning onscreen, it just fails to put the "circled R" symbol against the programme, leaving to me think I have set a valid recording!