The inquiry did not increase your score. The inquiry triggered the update. There is one or more other changes that led to the overall scoring increase.
myFICO is a trigger based service. Not all activity with a scoring impact is a trigger so be aware of what is and what isn't a trigger.
http://myfico.custhelp.com/app/answers/detail/a_id/463/~/understanding-what-triggers-fico%C2%AE-3-bu...
You cannot rely solely on alerts to determine the cause(s) of a scoring change. You'd need to carefully review reports from before and after the scoring change.
