You have something else going on somewhere. I just tried your files on a test site. The test site is a WP install, latest version. It is using the 2017 theme. It has only ACF Pro and your plugin active. I created a textarea field named ‘funbotic_parents’. When I go to a page where this field appears it is set to readonly.
There is something in either the theme or another plugin that is interfering with your plugin on your site.
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users