You ask for a quiet visual beat and get a usable shot with a voice you never requested. It is tempting to keep regenerating until the soundtrack behaves, but that can throw away the one visual take that actually fits the sequence. The first decision is whether the unwanted voice exists only in the audio track or whether the image also shows someone speaking. Those are different repair jobs.
If the character’s mouth stays still and the voice is only on the soundtrack, preserve the video and test it in an editor with the generated audio muted. Do not judge the clip in isolation after muting it; place it between its neighboring shots and ask whether silence, room tone, music, or a specific effect belongs there. Add sound for a reason. A quiet reaction shot may need almost nothing, while a visible impact needs a timed sound cue. The safest workflow is to keep the original render, make a separate edit version, and label which audio was removed.
If the mouth clearly forms words, muting the track may make the scene feel more wrong. Look for a shorter section before or after the mouth movement, a cutaway, or a different angle that can carry the action. If no such section exists, a new visual generation may be necessary. It helps to write the next prompt around what the subject is doing during the silence, rather than filling it with repeated prohibitions. For example, specify a silent pause while a person looks at an object and the soundtrack is soft room ambience. Treat that as an experiment, not a guaranteed switch; check the rendered result before building the rest of the scene around it.
When sound effects and unwanted speech are mixed together, decide what is worth preserving. If a door slam is excellent but the same track has stray words, you can attempt an audio separation pass, then listen for artifacts at normal volume. If the separation damages the effect, rebuilding a simple cue from a sound you have permission to use may take less time than repairing a noisy stem. Keep a record of the audio you add, where it came from, and the use terms that apply to the project. A finished visual is not a reason to accept an unclear soundtrack.
A small test can prevent a long prompt fight. Render a few seconds with one visible action and a deliberately simple sound direction. Compare it with the original at the same length. If the voice still appears, you have learned something about the limits of that setup; the edit can remain your reliable fallback. Review the final export with headphones and with phone speakers, because a faint stray syllable may be missed in a noisy room and then become obvious once published.
Would you rather keep a visually strong clip and rebuild its sound, or regenerate until audio and image arrive together? What makes you choose one route over the other?