I have a problem that probably happens (or will happen) to a lot of Klipfolio users out there:
On line charts with more than one line, the values often cover each other which makes them unreadable, as you can see on the screenshot.
I suggest to prevent this by making sure that values are not displayed on top of each other.
I already mailed with the Klipfolio support. Unfortunately they only told me to post this here, even if this is a bug report and not a feature request.