mistechnical (adj.), mistechnically (adv.) indicates that a rule, charter, ordinance, or law is, was, or will be used to effect a result opposite the intent of the rule, charter, ordinance, or law.
It was mistechnical use of the law that won the trial.
The exective order promoting the employee should have been stamped by five officers, but, by negligence, it was only stamped by four, so the employee mistechnically didn't get promoted.