Also see: "Not seeing what you think you should be seeing in the All Boards area?"
The Blippit Dashboard remembers
The DashBoard remembers what you were looking at last and this behaviour includes charts too.
To see all of your data in a chart make sure you click the 'X' by the chart title to see the whole data set.
Filters in play
If a filter for Key Stage or year group has been applied to a chart, it stays applied until you change it again.
To reset, choose 'None' from the drop-down.
Date Range in play
Sometimes it might help to reset the date range either when viewing boards in a chart or on your timeline in the dashboard. Resetting ensures you see all boards in the dataset, assuming you don't have any filters applied like key stage and so on