And I think they stayed the way I wanted them to.
The only function that would help a lot in a responsive site is to stagger the body of the text. The text placed in 1900px would reduce automatically by the breaks, then if you think that the body is small in some break you enlarge, not the reverse.
This looks like a great feature request, I suggest you posting the same here - Adobe Muse CC: Feature Ideas
We collect all the feature requests and bugs here and also get it up-voted for prioritizing.