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The original image (the one that existed BEFORE the document was converted to a PDF) was probably sliced during the conversion to PDF and, as a result, existed in the PDF as an array of separate images. There is nothing that can be done during the PDF > ePub conversion to reassemble the pieces.
Your only hope is to manually rebuild a replacement image from the pieces using an image editor (Photoshop, ...). You can extract the pieces from the ePub by expanding it and copying out the images. Once you've reassembled the images in an image editor you can edit the ePub is Sigil and replace the multiple pieces with the newly combined image.
Humpty Dumpty sat on a wall (read: Humpty Dumpty = original document)
Humpty Dumpty had a great fall (read: great fall = conversion to PDF)
All the King's horses and all the King's men (read: tools to convert PDF back into a real document)
Couldn't put Humpty together again.
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