Failed to move assigned images to dataset

I failed to move the assigned images to dataset and there is 105 images already annotated and moved to the dataset, but there is no result in dataset page. I don’t know how to move the assigned images so that I could assign more to annotate.
How could I solve the issue?

The error occured when I tried to assign more images, since some of them had been annotated by me, and I don’t know how to move them out.

Since new users can only put one embedded media item in a post, I added the image in this reply.

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