Dashboard not changing fully white

I was trying “Node Exporter full” dashboard template. It was rendering correctly:

However when I change the theme to light, those gauges look weird. They retain the black background:

How can I change that black background color in gauges? (I honestly feel in light theme it should be some light colored.)

Somethings wrong here. After changing theme (dark to light or light to dark), gauge’s inner color doesnt change. I have to refresh the page. Definitely a bug !