Score doesn't change from 100%

Amanda Breeze

Lately I've been finding the grammar and style score is not changing from 100% even though you can see it's not.
Attached is a screenshot showing that PWA has found 62 suggestions, some are marked on the screen, yet the score is still at 100%.
I am using the PWA version 3.1.420.0 plugin for MS Word (Office 365) on Windows 10.