minor bug - todo task multiplication

When I pin a task in Lists section and schedule it in timeline the pinned task moves to the bottom and is greyed out. However, when I unschedule this task from timeline the task in Lists is again displaying as pinned and the greyed out version is also still displaying. When deleting the greyed out task the pinned one is not affected so there is some kind of copy which created when the task is unscheduled.