Social networks options to share are not shown

Hello.
My website is https://namhyojin.com
My newspaper version is 11.1

I am trying to add social network icons in each post to share the post to social networks following the guide below;
https://tagdiv.com/social-network-buttons/

But strangely, the options of social networks icons are not shown properly. Currently, only Naver is shown like the image below. The pull-down menu doesn’t work.
https://namhyojin.com/wp-content/uploads/2021/07/Newspaper_social-networks.png

I don’t know why this happen.
What should I do to see and choose more popular social network icons including Facebook here?

• This topic was modified 5 years by namhyojin.
• This topic was modified 5 years by namhyojin.
• This topic was modified 5 years by namhyojin.