Hello,
I found a problem in your plugin which runs wp_kses() on all fields using acf/update_value in the file acf-form-shortcode-master\includes\class-acf-form-shortcode.php:170.
The acf/update_value hook without selector is a wildcard hook which is applied to all ACF fields. The problem with wp_kses() is that it deny the usage of HTML markup in any field, even the one that are not related to the plugin.
This leads to problems with fields that are meant to receive actual HTML code.
Regards.