Shaded areas on PDF after exporting from Indesign

hello, i'm working on booklets work using indesign. far of information in booklet have been placed pdf files. supervisor sent me pdf added booklet. problem when placed pdf onto page looks fine once export booklet indesign pdf see shaded areas on page. has never happened before , can't seem fix it. have ideas?

can post screen shot? use camera icon on web page this:

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