I don’t know the technical details of chatgpt but other language models have a sort of randomness tuning that makes them produce more unlikely stuff. Chatgpt appears to be deliberately tuned to produce very likely, very cliche, very rote output. Great for bloggers or people who want text summaries or boring professional content, not great for creativity. It’s not a ‘fault’ of chatgpt per se but it a consequence of chatgpt’s intentions, not the user’s.