The ticket is still valid. This minor error is not enough to get the case dismissed. Thee are many ways, however, to obtain a favorable result.
Feel free to call me for a free consultation. Depending on what the three violations are for, you may not need a lawyer. We'll be glad to review the tickets and help you proceed.
It is interesting that you as this question today. Last night I dealt with this very issue in a legal guide I published on this site.
The short answer is, unfortunately, the mistake is not enough to vitiate the summons.
See the guide for further clarification or call my office for a free consultation.
Law Office of Terri B Kalker