Thymeleaf/Javascript Expert for Code Fix

I'm urgently in need of a proficient programmer who excels in Thymeleaf, Javascript and jQuery. My project is experiencing an unsettled functional error causing interactive elements to behave incorrectly. Hence, my priority is to:
- Correct these malfunctioning interactive elements
- Be adept with select2 Thymeleaf data
Preferred freelancer should demonstrate:
- Deep knowledge of Thymeleaf, Javascript, jQuery
- Experience troubleshooting and resolving functional errors of this nature
- An ability to provide effective solution promptly.
Seize the opportunity to swiftly restore my code functionality to its prime state.

select 2 has data drivien from two arrays one array has the full list and the second array has the selected values that should select 2 control show them. I currently have duplicated values that I want to get rid of preferably using Thymeleaf inline expressions.

I attached screenshots of the code and the output explaining the issue