Your plugin is not correctly including JS and/or CSS. You should be using the built in functions for this:
When including JavaScript code you can use:
wp_register_script() and wp_enqueue_script() to add JavaScript code from a file.
wp_add_inline_script() to add inline JavaScript code to previous declared scripts.
When including CSS you can use:
wp_register_style() and wp_enqueue_style() to add CSS from a file.
wp_add_inline_style() to add inline CSS to previously declared CSS.
Your plugin is not correctly including JS and/or CSS. You should be using the built in functions for this:
When including JavaScript code you can use: wp_register_script() and wp_enqueue_script() to add JavaScript code from a file. wp_add_inline_script() to add inline JavaScript code to previous declared scripts.
When including CSS you can use: wp_register_style() and wp_enqueue_style() to add CSS from a file. wp_add_inline_style() to add inline CSS to previously declared CSS.
Note that as of WordPress 5.7, you can pass attributes like async, nonce, and type by using new functions and filters: https://make.wordpress.org/core/2021/02/23/introducing-script-attributes-related-functions-in-wordpress-5-7/
If you're trying to enqueue on the admin pages you'll want to use the admin enqueues.
https://developer.wordpress.org/reference/hooks/admin_enqueue_scripts/ https://developer.wordpress.org/reference/hooks/admin_print_scripts/ https://developer.wordpress.org/reference/hooks/admin_print_styles/
Example(s) from your plugin:
ticket-hub/shortcodes/th-ticket-sc.php:84