Title doesn't matter at all, Your job duties and responsibilities does. May be you job description was more closely matches that NOC and that's the reason they mentioned that appropriate NOC on your profile. If you score enough point without that job than don't bother. If you must claim that employment period to reach minimum point score which is 60 than that's a matter of concern. In that case provide updated employment letter mentioning you duties closely marches your NOC. Have a great weekend.
By the way, in which section did they put your NOC's?