Hello,
Thank you for your response.
Can you please try to activate one of the default themes like twenty seventeen or twenty sixteen and check the issue again? If it resolves the issue it can be a conflict with your theme.
Secondly, you have protected the content and restricted right click and copying etc on article pages, you are doing that using some plugin that plugin can be an issue also because it has disabled all events on the page. We are not able to debug the issue that way also, please check by disabling the plugin temporarily also.
Please check the above instructions and let us know how it goes so that we can check further.
Thank you