Canonical URLs show no protocol

Hi,

When I select HTTPS as the protocol for canonical urls, it still shows no protocol in source code, like this “//domain.com/”

Then I enabled Custom Canonical urls and edited the home page to “https://domain.com/”, but STILL in source code it is “//domain.com/”

How would it be possible to have https as canonical protocol and still use All in One SEO Pack?

Thank you!!