Why can't I access secure sites from my mobile web?

mia

New member
When I try signing in to secure sites (https) on my cell phone web browser it says there is a problem with the certificate. It will let me look at the site but will not let me sign in and view my personal information. Why is this and how do I fix the problem? An example web page is www.shelfari.com. I have a Samsung Behold. Thank you for your help in advance.
 
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