Why does this inscription appear every second? What is the logic?

If this message appears during timeline playback, it could be due to a clip being played in reverse. In such cases, Premiere Pro may need to render the audio before it can play back properly.

If you’re seeing it during rendering or export, it’s likely caused by a mismatch between your clip’s audio sample rate and the sequence’s sample rate. To avoid this, make sure both are set to the same value.