iOS Facebook app zoomed icon - ios

Question

I have some problems with Facebook sharing. Posted messages look normal via browsers (iOS, PC and Mac versions):
And only FB iOS app shows it wrong:
What could be the reason for this?
UPD:
I tried 200, 600 and 158 pixels images. Result:
My code is:
public LevelUPFeed (int reachedLevel, string pictureURL) //LevelUPFeed : IFeed
{
_linkDescription = string.Format("Just reached Level {0} ", reachedLevel);
_picture = pictureURL;
}
public void SendFeed (IFeed feed, Action<bool> callback)
{
//... callback creating
FB.Feed (
feed.ToId, feed.Link,
feed.LinkName, feed.LinkCaption,
feed.LinkDescription, feed.Picture,
feed.MediaSource, feed.ActionName,
feed.ActionLink, feed.Reference,
feed.Properties, convertedCallback);
}
feed = new LevelUPFeed (level, pictureUrl);
FBManager.SendFeed (feed, onFeedSent);
feed.LinkName is "Game Name", feed.Link "https://facebook.com", feed.LinkName is "Level Up!". All other strings is string.Empty
Picture links:
600px : http://i.imgur.com/10DdiWc.png
200px : http://i.imgur.com/0Smpm6s.png

Answer 1

There are image specifications in the Open Graph Sharing Best Practices documentation. Use PNG or JPG, 72 dpi, at 600 x 600 pixels for a feed image. The Feed Dialog documentation says 200 x 200, but the Games feed is specifically mentioned in the best practices document.
There are two different image sizes to use for game apps:
Open Graph Stories Images appear in a square format. Image ratios for
these apps should be 600 x 600 px. Non-open Graph Stories Images
appear in a rectangular format. You should use a 1.91:1 image ratio,
such as 600 x 314 px.
If this does not answer your question, could you post your API call code?