Facebook Feed FB UI Parameter not used – Facebook api

im using this code

var shareurl = FullURL to the Site;
var shareimage = FullURL to a image;
  $(".FB-share").on('click', function(e) {
    var shareEntry = {
      'method': 'feed',
      'link': shareurl,
      'picture': shareimage,
      'name': 'My Share Name',
      'caption': 'My Caption Text',
      'description': 'My Description Text'
    };
    console.log(shareEntry);
    FB.ui(shareEntry);
  });

  window.fbAsyncInit = function() {
    FB.init({
      appId      : 'XXXXXX',
      xfbml      : true,
      version    : 'v2.9'
    });
    FB.AppEvents.logPageView();
  };

  (function(d, s, id){
     var js, fjs = d.getElementsByTagName(s)[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement(s); js.id = id;
     js.src = "//connect.facebook.net/en_US/sdk.js";
     fjs.parentNode.insertBefore(js, fjs);
   }(document, 'script', 'facebook-jssdk'));

With a click, the Feed Dialogs opens, but the values from the FB Object are not getting displayed. IN the Facebook Dialog i get text and images from the Page itself.

I dont understand this, because we have another website with the exact same code, and everything is fine.

I already tried different api Versions, different Browsers, etc.

The App is currently in sandbox mode. Off Course i tried Sharing with logged in to my Facebook Developer Account.