relative urls missing base url on project page

[infominer33]

I have a project page (https://user.page/project)

In my index.html if I make a link like so:

<a href="/foo/">/foo</a>

The link builds as https://user.page/foo

rather than https://user.page/project/foo (as expected)

I went so far as to add a base tag to the head.

<base href="{{ site.url }}">

---

I have other project pages that create the urls just fine, and I have the same settings in config.yml.. so I'm at a loss.

https://infominer.id/bitcoin-history

the very first link on that page is an example ^^^

thank you!

[infominer33]

probably an operator error, but I defined a custom variable to work around it