Unknown external links to my site

Hello,
I am using OceanWp as my site theme, this is my favourite one (I helped my friends build another two site with customify and astra though)

So i just noticed that there’s many unknown external links to my site through Google search console. One of them is upsetting me.

Check on https://www.cifshanghai.com/wordpress/ocean.htm, you could see they list a lot of sites built with OceanWp theme.

This cifshanghai.com is a local website builder mainly provide web building service to web-rookies but engaged in export busines like me. I do not even know this site before until i noticed them through Google search console – external links.

I ever tried to contact them to remove the link to my site but they don’t reply.

So i checked this issue with my hosting provider to figure out why they found me, my site is poor designed anyway, the support person looked through my site files and plugins, and think the problem may be caused by the plugin named ‘Ocean Extra’. They are suspecting this plugin is sharing its user information or leaking it by some way?

If this is true i think i have to delete this plugin..

Anyone could share any opinions on this unknown external link issue would be highly appreciated.

And i look forward to hearing from the theme/plugin author’s reply.
Thank you.