One copy of "Celebrities are Cool" magazine is an issue. It is issued, or put out, by the publisher. You and your mother may argue over the issue, or topic, of whether or not you should read it.
The original meaning of the word issue was to put something out. If a celebrity issues a statement or the post office issues new stamps, they put them out for the public. Likewise, an issue is a current topic, sometimes controversial, that is being discussed. Politicians often say they want to talk about the issues (and not their personal lives!). You might hear someone say, "He's got issues" about a person who has some problems, usually emotional ones, but this is a very new use for the word.