Sometimes when I paste text from another app (Word or Google Docs), InDesign insists on inserting line breaks that I can not remove. Some (but not all) lines of text do not fill the width of the text box. Wehn. I try to backspace the next line to fill the empty line above, nothing happens.
In other words, I can't get some lines of text to fill the full width of the box. I've tried pasting the text without formatting, but that doesn't work either.
It looks like you have Balance Ragged Lines enabled.
That's it Barb. I do use Balance Ragged Lines when necessary, but didn't think that it would affect pasted text.
It sounds like it was on as a default so you were pasting into that formatting without realizing it. Here's a link to a post on how to control the defaults that you may find helpful: https://www.rockymountaintraining.com/adobe-indesign-setting-and-removing-defaults/