One more thing.
You wrote that before installing this plugin, this behavior was not occurred.
Have you tried it on a standard WooCommerce tab (e. g. Description tab) before installing our plugin?
If not, please inactivate our plugin, and insert this form to the standard Description tab of WooCommerce, whether the problem occurs without our plugin or not. Please send a screenshot about it.
Please also send the URL of your site where the original problem can be seen (according to our previous post).
Thanks in advance.