CircleCI builds remain private after making Github repo public

A few days ago I made my repository public:

https://github.com/onimur/circleci-github-changelog-generator

But I can’t still see all the CircleCI builds for it:

https://circleci.com/gh/onimur/circleci-github-changelog-generator

Is that the expected behaviour? How can I make sure my builds remain public?

In Project Settings> Advanced. The Free and Open Source option the switch is locked