My tasks on Mobile App do not all show up

My tasks on Mobile App do not all show up

On my mobile phone app ( android),  If I select My Tasks and sort according to Priority, only about 3 High, 4 medium and 14 low priority show up. On the web, and within the next seven days selected as a filter; I do have a total of 11 high, over 15 medium and over 15 low. 
Why can't i see all my task on my phone app, why does it only show some of them?