This is on one of the kanban style boards we have. The second I assign the task to myself, it marks the task complete and moves it to the appropriate column (or, it WOULD be appropriate, if the task were actually complete). It only happens when I assign the task to myself, not anyone else, and I can’t find a rule that would cause this.
Did you check 1) among all the project’s rules (or projects’ rules if multi-homed in multiple projects), and 2) in your My Tasks rules? The likely explanation is a rule is doing this.
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Larry