Links zu older Posts returning github domain

[ingm4r]

I've deployed lanyon in a setup like this:

Amazon Cloudfront <--> Github Pages

For Cloudfront I have configured my custom domain used for the blog. This domain is configured as url in config.yaml. All links work and the blog can be accessed at custom domain. The links generated at the bottom of the page (newer/older) also point to the custom domain, i.e. custom.tld/page2.
However when accessing custom.tld/page2 I get a 301 pointing to user.github.io the github pages domain.
Do I miss something here? Why does this request trigger a 301 back to github pages?

[ingm4r]

jekyll/jekyll-paginate#15