Hi
your problem is in a URL (you should use HTTPS URL in custom link as your footer menu block):
1) HTTPS – https://www.pendrivepersonalizzate.it/demo/negozio/
2) HTTP – http://www.pendrivepersonalizzate.it/demo/about/

P.S.
if you try to get with HTTPS it’s will be OK – https://www.pendrivepersonalizzate.it/demo/about/