Nothing wrong with Chrome, it's 100% the certificate on the site. The type of cert used was never meant to be used for a public website.
Don't use https:// in the URL, and you will not get the error. If you go to http://www.nzhuntingandshooting.co.nz/ and still get the error, sing out. I'll PM you the details on how to clear the HSTS token from Chrome..
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