When I look at my burndown charts the left axis of the chart (amount of story points remaining) shows all tickets that I put in any sprint so far and adds them up.
e.g. the sum of story points of my sprint is 70. So I expect the burndown chart to start at 70 and then go down accordingly. However this number is around 300 which is approx. the sum of all story points of all tickets ever worked on.
See screenshot attached:

It seems to me that the burndown chart is taking the wrong statuses into account - or somehow my tickets are never "done" although they are.
Thanks for help!