Issue with document figures being blacked out

I am hoping someone can help me with an issues I have with 1 journal. When I load it into Zotero the figures/pictures have a quarter circle of black in the left hand corner (see attached). It is the first time I have had this happen and is not happening for any other documents. The document is fine when I open it in a pdf reader.

Any advice would be greatly appreciated.

Regards
Claire
https://s3.amazonaws.com/zotero.org/images/forums/u14003950/qlpopvh0x7q9n82409gk.jpg
https://s3.amazonaws.com/zotero.org/images/forums/u14003950/hy5ylp2yudsn19rhpbsw.jpg
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