I agree. I have never lost a recording. It is almost certainly faulty labelling of the programme in the EPG.
Recently Episode 8 of a series I was recording changed the folder name to Episode 8 and confused me. It was the last episode of the series so I was not able to check if Episode 9 would set it back correct. Sometimes recordings just get given other programme names – again almost certainly faulty EPG data.
Also films split into two sometimes get really confused – C5 and its bedfellows are the worst culprits.