Re-recording audio

If I have an audio track with multiple events due to punch ins, and I re-record the whole track, with audio record mode set on “replace,” then I would expect the new event, my new audio, would replace the old events.
No?
But what’s happening is that halfway through the song there’s an event start, which seems to Play some part of a previous take.
I don’t understand this.
Anyone?
Thank you