exploit prevision loadlib error when opening office docs

Hi,  we have just got exploit prevention installed on-premise, but certain users are having issues opening office docs and PDFs.  When they try to do so, the file closes immediately with a message about exploit prevention.  Looking in the computer details tab in SEC, it shows the event as LoadLib.

I have had to disable protection for these programs as it's preventing genuine files from being opened.  Why is this happening??