Hi @cengizhanfoicey,

This is just a small CSS conflict with the theme or other plugins. Please use this CSS code to solve the issue: 

#wpdcom .wpd-social-login i {
    font-family: "Font Awesome 5 Brands" !important;
    font-weight: normal !important;
}

Put the code in the Top Admin Bar > Customize > Additional CSS > "Additional CSS" textarea, save it, delete all kind of caches and check again. 

Please don't forget to press Ctrl+F5 (twice) on the frontend before checking.

We also see some other conflict. See the screenshot below:

Use this CSS code to solve it as well:

#wpdcom .wpd-form-row .wpdiscuz-item .wpd-field-icon{
    top: 15px;
}

Thanks for quick answer, second code is worked but first code is not working 

I got a mistake by trying to add the code which you sent me. I attached the ss and I translated the notification received.

#wpdcom .wpd-social-login i {
font-family: "Font Awesome 5 Brands" !important;
font-weight: normal !important;
}

"Something went wrong. Wait a few seconds and then try again."

When I added these (second) codes in additional CSS, worked

#wpdcom .wpd-form-row .wpdiscuz-item .wpd-field-icon{
top: 15px;
}