If the links are present in the HTML stored in the database there shouldn't be an issue with them being put in the RadEditor. Note that they must be valid HTML in order for this to work as RadEditor is an HTML editor. What happens if you put the HTML string you would pass to RadEditor in a simple literal control (or div with runat=server)? Are the links present? If so, can you post here the RadEditor declaration and a sample string that, when passed to the editor, loses the hyperlinks so we can see what the problem is?
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