Overprinting and splitting letters when converting from word .docx

Hello

I have a 57 page word doc (made in Office 2010) which when it is converted to a PDF (via Acrobat pro 8) has a strange splitting of letters and slight overprint. I've included a screen shot below of the problem. I sent the document to someone with an updated version of Acrobat and they had the same issue.

Any ideas why it does this??