I was thinking. In which episodes did Charmed have problems with Temporal Paradox. I have it hard to remember. I can only remember the episode "A Halliwell's Eve". Because Cole had already rewritten the future 300 years ago before them making it pointless to send the Charmed Ones back in time due to they are now turned evil. They were not protected like Paige was when Cole created a alternative reality. What Paige's pastlife wanted to do with the Prince in "A Knight to Remember".