We are sorry for the inconvenience caused, we didn’t find your exact issue. Could you try by activating other WordPress Standard themes and see if this issue exists or not. If issue exist on other themes as well then you need to consult to respective plugin author else you can send us possible screenshot of the page where you are getting issue.
I’ve attached a sheet on the steps. The site is up so I can’t change the theme at this moment. I hope these will illustrate when it’s happening. Please let me know if I can provide more information. We contacted the LMS LearnDash and they told us it was most likely a theme issue.
Thank you very much for your patience, We are able to replicate error on our end with effective-emails-to-passive-candidates-course course.
Here is what we found.
There is no text coming for ok button , please see attached screenshot below. All css are applied inline and we guess this button is rendered using jQuery. If there is conflict with theme js then please try by removing js script from functions.php. You can look on puresimple_scripts() of functions.php. You can comment out wp_enqueue_script() for checking.for an example.