Pagination is adding index/ after BASEURL and before paginatePath -- not sure why

I’m using this theme:

my config says:

uglyURLs = true
disablePathToLower = true
paginatePath = "page"
canonifyurls = true

for some reason pagination links look like this:
http://site.com/index/page/2.html

There is no reference to “index” in the theme:

href="{{ .Paginator.Next.URL }}"

In fact, here we can see all files containing the string “index”:

$ grep -r “index” . -l
./.git/hooks/pre-commit.sample
./exampleSite/content/post/creating-a-new-theme.md
./exampleSite/content/post/goisforlovers.md
./exampleSite/content/post/hugoisforlovers.md
./layouts/_default/single.html
./layouts/_default/summary.html
./layouts/partials/meta-terms.html
./layouts/partials/sidebar.html
./static/css/cookieconsent.min.css
./static/css/lightbox.css
./static/css/lightbox.min.css
./static/css/style.css
./static/js/cookieconsent.min.js
./static/js/lightbox-plus-jquery.js
./static/js/lightbox-plus-jquery.min.js
./static/js/lightbox-plus-jquery.min.map
./static/js/lightbox.js

With other themes, I have had similar issues. Pagination URL generation is quite opaque to me.

  1. What is the output of hugo version?
  2. What is the FULL output of hugo config?
  3. Do you have a link to the project source? GitHub?