That's strange. What should help is to instruct the AI that it can't include any choices that lead to resetting or returning to a past encounter. Try adding this to your choices prompt, best location would probably be between "...given their current stats and location" and "Write the choices in a...":
The choices cannot instruct the player to reset any current encounters or to go back to parts of an encounter that have already happened. They must instead be focused on the current encounter and anything that may be happening around the player.