My team has been notifying me of a problem that I cannot seem to solve. On some occasions when they complete a task, it changes the assignee from themselves to someone else. I have checked our entire environment for a rule that could be causing this issue but I cannot find anything as such. Would anybody know why this is happening?
If you look at the activity history for the task (at the bottom of its detail pane), you should see an event for the assignee change, which will hopefully give you a good clue as to the source.