Duplicate URL's (Double URL) in Joomla site

Question

I'm using joomla platform. I have small issue with a url.

karisalmedia.com is my domain and online is the subfolder. in my site article comment shared on community page.

if i access the url from the community page it's going to 404 page.

• Correct url: https://karisalmedia.com/online/index.php/ta/236-2018-07-02-05-23-16

• Wrong url: https://karisalmedia.com/online/online/index.php/ta/236-2018-07-02-05-23-16

How to remove one /online?