Form Default font not working, styles not cleared on paste.

Acrobat I'm using a form that's set to only use a font Times New Roman at 12pt. Why doesn't Acrobat force things I copy and paste to become that font and size? The properties are set. It takes a lot of time resetting fonts, to the font that's supposed to be default locked. These are legal documents. Can't I have a document only use one font? I've tried tons of examples to fix it, all failed. More time consumption. I should paste and the styling should be removed prior to pasting by acrobat. In law there's a lot of citing and quoting. Font sizes differ.