Tasks Completed was Removed?

Hey guys have you noticed some of your completed tasks were removed? My tasks yesterday was 20+ completed, and I checked my dashboard I only got 14 task on the graph? What is happening now, I am sure that a got 20+ task because I always checked my dashboard. Is this a server error or something?

Hello Sir,
(1) Today Not Give me Task.
(2) Website Slow Opening .
Kindly Fix This Problems.