When the justification is set to "justified," when I add or delete text, text moves down from previous lines, making those earlier lines look really stretched out with huge spaces. This happens constantly. It looks really bad, and there's no logical reason for it.

This happens whether "Hyphenate" is on or off.

Each line of text should always hold as many words as it can hold (without shrinking anything to fit). What happens on any later line should never cause any change in previous lines.

I'm using InDesign v. 19.3 x64 in Windows.