Yes, i ve noticed something similiar happening as well. Steps I have taken.
1) Erase / delete: refresh I found that this helps delete unwanted files.
2) clear cache
Duplicate results
this does happen occassionally.
Steps that I have taken. 1) Delete the unwanted files.
2) Download or take a screenshot of the image that closely matches my desired outcome. a) I may even go into "generative fill" and clean up the image. Then download it.
3) Take the cleaned up image into a completely new Firefly tab and use it as either a "reference image" or "style image"