Something my created images look more then realistic and the next day even a blind person can spot that it's AI

Hi, I created a AI girl like 1 year ago on tensor(dot)art, I trained my model with a lora there. The pictures which I create looks almost always like her. But there is 1 thing I never understand or can make it correct. And that is the quality of the create images. Sometimes it looks then realistic, so even I belive it's real, and the next day I create images she looks like an alien with like 20 finger and 5 legs. also the quality of the image is very poor. So the whole thing is messed up.