Each time I set up a new document in InDesign (and only in indesign this happens), it defaults to Pica measurement (my preference is set to mm) and when I change it and begin to fill out the measurements, it reverts back to pica 2-3 times before it'll stay on mm.

I've tried:
-re installing
-changing/checking preferences
-resettting preferences

Unsure if a bug or something I've missed.