Social login works fine in PC, but in iphone looks abnormal

Hi,

We have installed the social login plugin in our web site www.buyshipkingdom.com, it works fine when browsed in PC using chrome, but when I browse in iphone Safari, I can still see the "facebook login" icon, but when I press this button, it always ask for user name and password, and seems cannot recognised I have already logged in facebook in the facebook apps. Anything I am missing ? Thanks.

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