This problem occurs for all SVG display types, which are bar, line, stacked bar, and meter.
The problem is that Netscape caches the first SVG chart displayed. The first time you go to one of the views that displays the data in a bar or line, it looks correct. But from then on, it always shows the same chart and data. If you refresh the view or go to another view that has one of the SVG charts (even if it is a different type of chart), it continues to show the same chart and data, because Netscape cached it, and won't refresh even if you reload the page.
The workaround is to disable caching in Netscape so that it loads the SVG charts every time.