Twilio SMS Automation Debugging

I'm in need of an expert to help debug my Google Sheets App Script for Twilio automated SMS messages. It appears there may be a bug causing multiple messages to be sent, as evidenced in my Twilio log.

Key Responsibilities:
- Review and debug the App Script on Google Sheets
- Identify any bugs causing multiple outgoing messages
- Implement fixes to ensure proper message delivery

Ideal Skills and Experience:
- Proficient in Google Sheets and App Script
- Extensive experience with Twilio, particularly SMS automation
- Strong debugging skills to identify and fix issues
- Ability to work with frequently changing data in a timely manner.