sorry for using the wrong word, I’m from Germany and my English isn’t the best.
the pictures where taken from the client. He gave me a folder via WeTransfer. Mostly jpg pictures, I think taken by mobile. LI’ve uploaded them all in the WordPress backend. A few days later I’ve tried your plugin and started a bulk conversion. Then I had the problem. I’ve also deleted all webp images and set the option “save metadata in exif…”. This do not solve the problem.