Only some of the images were converted to webp

Hello. I decided to compress all the images on my site and convert them to webp. With the settings as in the screenshot https://imgur.com/EiRqvLb , I selected all the images and start. But now only some of the images on my site were converted. Some images are in webp format, others in original. They are no longer in the list of images, that is, they are marked as compressed. What should I do?

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