InDesign 15.0.1

When I create a rectangle with fancy corners, when I change the stroke to the outside it won't let me adjust the size of the box. If I grab the side and drag it to where I want it snaps into place smaller. If I go up to the tool bar at the top & try to change it that way regardless of whether I try to change it bigger or smaller it just makes it smaller & it doesn't just go 1px at a time it changes 6px+ & if I try to just do vertical it will change both.