Something very strange happened, history of a ticket clearly shows a specific time when I changed assignee to myself, I never opened the ticket..
Do I have ways to investigate this? Can I know how it was done? from which machine etc.?
Another possibility ... though you say you didn't view the issue, perhaps you did (possibly accidentally) and accidentally pressed the keyboard shortcut ("i", I think) for "assign to me". I've done that a couple of times.
Perhaps there was auto-assign on a component.
A component default assignee will override the project's overall default assignee.
Another common reason is a workflow post function assigned the issue to you during a transition:
"Assign the issue to the current user. Please note that the issue will only be assigned to the current user if the current user has the 'Assignable User' permission."
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