I'm very sorry about that. I used MergePDF to merge the cover and the body into one file. My best guess is that's where the issue is introduced. I created a share folder on Dropbox with the current docx and a PDF generated directly from Word. Besides the format, the only differences besides the missing cover are the index of illustrations is moved to the beginning and contrast was improved one or two images.
If neither of these work, I can try some other formats, or possibly breaking up the file if you believe it's a size issue.
https://www.dropbox.com/sh/1ta0g11rf0ipdmk/AABsudPiCrlJDryANoRvODE_a?dl=0