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Although being hacked seems like the only reason I can think of at the moment, I am still scratching my head! Its only showing the HTTPS urls in the Google search results. Not in Bing or Yahoo etc. I can't see any of the HTTPS urls when I perform a crawl of the site in programs such as Screaming Frog.  I could understand if we were hacked that it would show spammy results with dodgy links but the results aren't spammy, the Titles and Descriptions are from one of our customers websites? Their site has not been hacked though.