By the way, I've checked from the Easyblog archive module (
http://www.roygigolo.com/blog/calendar/2016/1), it seems like article (Gigolo Monza) also pointed to this post URL
http://www.roygigolo.com/blog/video/gigolo-monza
The canonical link also show correctly.
<link href="http://www.roygigolo.com/blog/video/gigolo-monza" rel="canonical" />
Then I noticed when I view this page
http://www.roygigolo.com/blog/post-ironici/gigolo-monza , the canonical show :
<link href="http://www.roygigolo.com/blog/post-ironici/gigolo-monza" rel="canonical" />
I re-check again, it seems like this plugin `addcanonical` causing this issue, when I disabled it, it should work fine now even you access these following post URL, that canoncial link will show the same URL and followed which category set to primary from the blogpost.
http://www.roygigolo.com/blog/post-ironici/gigolo-monza
http://www.roygigolo.com/blog/video/gigolo-monza
Can you give it a check again?