animation not animating

I use Firefly to creating looping scenes, so the first and last image are the same. This isn’t something I used to do, but it seems adding “first frame identical to the last frame” in the prompt is far to complicated for AI to understand. Anyway, Sometimes it hits, but mainly not. I doesn’t matter if I use Firefly, VEO, Kling.. 4 out of 5 times it completely ignores the prompt. It either animates nothing at all or goes totally off the rails creating something I didn’t ask for. The last month has seen things get worse… the credits I am wasting are ridiculous. 

The animations I am creating are not complex, I am literally asking for lighting, mist, fire effects. That kind of thing. Getting 5 to 8 seconds of no movement or something moving around I didn’t ask for is totally frustrating and expensive!