Problem creating multiple clips in Firefly with same AI Model

I am using the Adobe Firefly web app on a MacBook Pro Sequoi version.   When I first created a video in Firefly it was the answer to my needs!  Since there  is a limitation of 8 seconds for each clip,  I was able to generate numerous clips of the same AI model and setting with the different dialogue and then merge the clips into a long video using the same AI model and setting.  I have waisted about $40 trying to continue creating. For the male model I was using, when I tried to recreate, I got 4 different models. I then decided to go with a female and try again. once again every female model was different.