Hello!
Thank you for the feedback and sorry for the issue.
We test Social Share Buttons WP plugin compatibility with different third-party plugins and Themes. But we can’t test all of them.
So some times some conflict appear in JS or styles.
Provide URL of the website you’re using Social Share Buttons by Supsystic and I’ll do my best to help you.
For the faster reply contact us here or through the Social Share plugin forum