Installing mathjax has made the problems viewable.
Thank you for your help and advice everyone.
This was the response from my IT department.
The installation directions weren't very precise, however, I think I have what you need. See if it works now. This is what I've done, and have added to our installation instructions.
git clone https://github.com/mathjax/MathJax.git
git gc --prune=now --aggressive
I can verify that there is now a directory /opt/webwork/MathJax/ and your symlink at /opt/webwork/webwork2/htdocs/mathjax does point to the new directory ../../MathJax/ or the full path /opt/webwork/MathJax/
I hope this helps future people