leftside bar: the linked-In icon in place of the twitter

Hi,

I’m using the latest version and when configure only for sharing via facebook like, fb commend, twitter and google+, I’ve noticed that the icon of the twitter on the left side bar is replace by linked-in icon.
While the icon of the twitter is correct shown on the bottom of the page.

Please advise how can I fix this.
Thanks, Henry.

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