Unwanted translations in Rise 360

I've created a matching activity, for matching abbreviations with descriptions. 

However, when I enter UN (one of the abbreviations), it displays as ONE. Suspecting that it was eagerly translating from French, I input DEUX, and yup, it displayed as TWO.

It's happening in my work subscription, but not my personal subscription. 

For now I've chosen a different abbreviation for my matching activity, but has anyone else struck this - or have suggestions? Is it related to HTML Language Identifier for Screen Readers - and even if it is - is there a workaround?