AI image generator repeated mistakes

A few weeks ago, I started using the Copilot image generator to design characters for a book I'm writing. Three of the four character went fairly well, but the fourth one is giving me lots of problems.  The main one I'm having now is I tried adding a 3D effect but the system keeps making the same mistake.  The charact is a lion that has an actual flame at the tip of his tail.  Copilot keeps putting the flame on the ground instead.  How can I fix it?