I keep having this issue with text. See forum post http://forum.webflow.com/t/text-does-not-flow-correctly/3412
Somehow these NBSP elements get inserted into text causing text not to respond to container width, hence staying on one line, while nomally container boundaries would force text to flow to a second line.
I am not copying text from another source. Just typing it into Webflow.
I run the latest version of Chrome without any extensions on an iMac. I have no weird keyboard stuff installed or anything.