Looks like you may have "Interpolate" and "Fill to edges" switched on.
Right-click on the map and select the "Copy/Paste Default Settings" option and make sure it looks like this:
Attachment 23746
More info about interpolate and fill to edges:
Attachment 23747
(edit: I will also fix that documentation - it repeats itself and
has a grammatical error, this is just not correct English: "boundaries defined by labels a on the clipboard")
Regards
Paul