My Summary page shows 9 tasks as done but actually only 1 task is mark as done.

[Junaid Hussain]

My Summary page shows 9 tasks as done but actually only 1 task is mark as done.

[Nic Brough -Adaptavist-]

Welcome to the Atlassian Community!

Are your "done" issues all in the last column on their board?

[Junaid Hussain]

My board has three columns when I group them by priority. 

Highest Priority has 1 Task

Medium priority has 6 tasks

Lowest priority has 1 task

All these are open tasks

I have only one (out of above) task which is mark as done.

[Nic Brough -Adaptavist-]

But are they all in the last column on your board?

[Junaid Hussain]

No

I have three columns which are "Open", "Done" and "cancelled"

one task is under done and rest are in first column which are open.

if this is what you not looking for then I do not know how to check because I am new to this.

Thanks