I have a real oddity - on my front page (healthebuddy.co.uk) I have some custom html modules which show a pic, a bit of text, then have a 'How it works for you' button which links to an article. Both are set to 'public' (so is item in menu link) - but, if you are not logged-in, clicking on this button results in a 'login' page display.
I have searched high and low but can't find an answer - any ideas please? 
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