Then a paging loader replaces items in the store with only 20 items. It looks like the first 20 items from the previous graph are replaced with the new values (and properly spaced to fill the full width of the chart).
The 30 remaining items are shown behind the new ones. This happens in firefox and chrome on ubuntu.
Thanks for the report. This is a known issue in 3.0.0 and has been fixed for the forthcoming 3.0.1 release. This can be seen in the new grid filtering for the dashboard example, which changes the number of bars. http://staging.sencha.com/examples-d...lace:dashboard