dissapearing photo details

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I have a problem with dissapering photo details. I put the credit in the description - but the page is uploaded without it. when I tried to edit photo details, nothing happens. I tried to put it in comment, but I wasn´t allowed to... but what is really strange - some of my pages are ok, with description, and some without, although I´m always writing it in description. does anyone know what the problem should be, please?