Hi Rachid,
My Nintex only show the Forms the logged on user has submitted, what you are looking at is what we call a 'Business Owners' view designed to show all instances for a particular workflow and should only be accessed by people in the organsiation that requires access to all submissions so they can gain more visibility into all the process they care about. It's not designed for individuals as they already have this information as part of their submissions .
Hope that makes sense..