When in a wiki with URL http://<host>/, URL factory generate "secure" wikis URLs as https://<host>:80/ in place of https://<host>/

My main wiki is https://abc.zzz.fr (but the "secure" setting is 0, the https is managed in Apache in front of Tomcat).
When I created a new wiki with domain "abc.zzz.fr/test2" creation was OK, but the proposed URL is :
"http://abc.zzz.fr/test2/xwiki/bin/view/Main".
So I put the "Secure" setting to 1 and save, and then the proposed URL is :
"https://abc.zzz.fr/test2:80/xwiki/bin/view/Main".

Good for the "https", but why ":80" is added to the wiki name ?
I know that kind of domain is not supported now, but I just don't understand : If I check "secure", I don't need to be redirected to the 80 port.

Then I tried to add a new wiki on another sub-domain : "test3.zzz.fr", and after checking the "secure" to 1, I get the URL :
"https://test3.zzz.fr:80/xwiki/bin/view/Main/". Same problem.