Exported fixed layout epub pages size error when previewing in ADE

Greetings, i'd need an help with an issue that's driving me crazy: i have an epub with animated gifs ,moving texts and audio files in every pages, but after exporting it when previewing in adobe digital editions the most part of the pages show at roughly half the original size,while other few are fine.
I don't know what might cause it,it's driving crazy
i attached a picture for help