[seqfan] oeis.org - oeisf.org and https

[reismann at free.fr]

I would like to know why there are two versions of the OEIS (classic and wiki) in https ?
https://oeis.org
https://oeisf.org
https://oeis.org/wiki/Main_Page
https://oeisf.org/wiki/Main_Page
Both signed with the same certificate : issued by Equifax - serial number:15:2E:F7 - signed for oeis.org
So when we go on https://oeis.org, there is no problem but when we go on https://oeisf.org, the browser alerts us to a security problem.
I think this may surprise common users and that one version of the OEIS in https is enough. But perhaps there is good reason for this situation
Best,

Rémi Eismann