Boost Update Interval

[pradeepspa]

I am experiencing the old issue again. For some graphs when I view it, it starts graphing whereas I don't see any previous data. For example if I open my graphs at 8am, I can see the"on deman update" wakes up but updates the graphs only from 8am. What happens to previous data? Do i need to delete and re-add the graphs? or is any other troubleshooting method for this?