So Mike’s dashboard is slightly broken at the moment and I can’t figure out why in his html grid layout, div element a is rendering incorrect. When I similarly try a fork and create a 2x2 grid of the same d3-histogram in all four quadrants, I get similar errors (div elements a and c render incorrect). So its not the chart.
My notebook was relying on the SVG elements having a width and height style set. I’ve updated my notebook to set these styles explicitly which should fix the problem. Thanks for the report!