Your generated characters or product shots change between images, and between frames inside one video. That is almost never a seed problem - a fixed seed only reproduces the same prompt, so the moment the prompt or the motion changes, the character drifts again.

I fixed exactly this on a production ad platform where faces changed between frames of the same video.

What you get

Character reference and image guidance set up properly against your reference image

Your prompt split into a locked identity block and a per-shot block that is allowed to change

A short written recipe so your team reproduces it without me

A working before and after on your own assets

Turnaround: 4 working days.