Link icon showing next to custom icon

Hello Nikita,

That’s because your theme provided standard icons for Social Links menu, you can check it here https://environmentalsciencelabs.com/wordpress/wp-content/themes/quality-construction/style.css?ver=5.1.1 line 824
You can hide the default icon exactly for this link by using CSS:
1. add any custom CSS class to the menu item (https://www.lockedownseo.com/add-css-classes-to-menu-items-in-wordpress/)
2. add custom CSS rules (you can extend your theme or install any plugin which allows you to add CSS):

.social-links ul li a::before {
    content: '';
}

Will close the topic for now. Let me know if it’s necessary further assistance.