Excel to PDF - Issue with formatting and text

[Cara5C0A]

I apologise if this issue has been asked before, I searched the forums and couldn't find anything that matches this issue exactly.

One of my team is having issues saving Excel files to pdf format (the issue is with Excel only, I am trying to determine if it's an issue in their Excel settings, or with Acrobat). 

When they save to PDF, the document ends up looking like a plain-text document - the fonts are different, the formatting changes, lines of text overlap, and any lines/graphs/colour disappear. Below is a snippet of one of the pages. This began happening late last week. Has anyone experienced this before, and if so, how did you fix it? 

Thanks in advance!