You have created 2 tasks in a Project and one is a child task and one is a parent in Gantt chart. When you update the % completion for the child task and ran the Update % completion job, the parent task % completion is not getting updated.
Release : 16.1, 16.1.1
The Project Properties field % Completion needs to be set to "Duration" or "Effort"
The child task needs to be a non-milestone task.