Text and vector drawable growing in size #27

I have a NestedScrollView as my root layout and a RelativeLayout which contains some editext above 2 radioRealButtonGroup. I've placed them below an editText using "layout__below" but whenever my editText grows in size the actual selected button in both buttons group makes both the vector icon and the label text bigger .

TL;DR every time a line is added to the editText the icon and the label grows by some X amount (apparently without limit).

Putting both the button groups into another RelativeLayout solves the problem