archive.org and "above root" error

[ben]

I am trying to copy a website from archive.org, the format is something like
https://web.archive.org/web/20180914202352/http://www.motorboards.org/index.php/Main_Page

So I say "Download Everyting" and in rules
I download everything that matches "motorboards.org"
and I exclude everything that doesn't match "motorboards.org"

However the vast majority of pages that I want are ignored because of "above root" error.
Why does "above root" even appear, if I say to download everything?
Thank you