Load distribution not happening the way it should

I am modelling a building that has a steel roof truss on the roof slab. Now while assigning dead and live load (Floor Load) on that particular floor, I am unable to see a proper distribution of forces that have occurred through the other floors. I am uploading the staad file to the secure server for help. Please let me know what is the issue.

The file has been uploaded successfully with the file name "IB_with truss" through the Bentley Secure File Upload website.