What you are seeing is the face detection retry attempts. This is normal for the software to do that. When it can’t find they face, it retries at multiple different angles. This helps it detect faces when the head is tilted. It will eventually give up and move to the next image after it has done all of the retry attempts.
So this issue is that it isn’t able to find the face in certain images. A coupe of questions….
1. do the images it fails on have a clearly defined face in the image? Or is the face covered?
2. Does it always happen on the same exact images or is it random? So if you run the same batch twice, does it fail for the exact same images? Or is it different images each time that fail?