Line spacing shrinks when making edits??

Hi there,

I’m having some trouble with the line spacing in paragraphs when I make an edit to the paragraph. Certain paragraphs do this, others don’t. If I make any change (mainly trying to delete lines or extra spaces above/below the paragraph), the line spacing gets out of sync and I can’t unchange it. I’ll post a picture so you know what I am talking about. If I try to undo it using ctrl-z, the option is grayed out and doesn’t work. Help please?

The only solution I’ve found is to copy the section of text, completely erase it, and then past to match style. It works but is very time consuming. Also, I’m formatting the text, not writing. The text was imported from a Word document if that changes anything.