Odd line breaks in Page for Mac

I get this issue from time to time when I paste text into Pages [in this case from Evernote into a document which is essentially rich text with no text boxes.

On the left is my source, on the right as pasted with what appears to be a hard CR at the end of the first two lines, but they cannot be deleted without either deleting the character ahead, or moving the wrap one word on. The problem seems to be that in the pasting word spaces change to non-breaking spaces for that para and the problem can be solved by replacing them with normal spaces.

I thus have a solution to the problem, but would rather stop it happening!