404 errors for Refresh comment optimization and Remove vote data

Hey wpDiscuz team, 

I have recently migrated from Disqus to wpDiscuz following these instructions:

https://wordpress.org/support/topic/migration-from-disqus-2/

While it all seems fine, I was unable to perform the last step. The two buttons mentioned:

[Refresh comment optimization]
[Remove vote data]

keep showing 404 error when clicked. That's why I'm not sure if the migration was successful/whether it would affect the performance of the plugin in the future?

Kind Regards,

Jacek