Possible chart bug

Hi,

I have this recurring problem with charts when for no fathomable reason the line chart inserts point markers as shown below.

This chart is inside a dashboard and when I expand to full screen I get

I have noted that this happens in Appshet when API changes are being made and then it goes away, but it is a real pain.

As far as I can ascertain AS are using NVD3.js and it appears markers are somehow being activated.

Thanks

Greg Diana