firefly failing to follow prompts, makes unrequested changes regularly.

I am trying to create a pic for my book. I’ve uploaded two reference images. One with a girl walking a huge dog. The other one just a girl. I asked it to replace the girl in image one with the girl in image two. It did. I asked it to change the image of the dog on the left to a two headed hell hound. It did but it changed the girl back. I asked it to change the girl again. It did but it changed the dog back. This same scenario played out several times. I reported it every time. Here I am after a half an hour wasted still no image that i wanted.😫😡