Site Not Autopublishing

Our staging site is not currently autopublishing when deploying to the staging branch in GitHub. Although, the master branch is publishing as expected. We are triggering builds with a webhook from a sanity.io dashboard. The builds still do not autopublish when pushing changes directly to the GitHub repo. The build starts and completes, but does not publish to the primary staging site, rather to a unique site id - e.g. 60528c32ee96a50008989d89–mylo-unleather-staging.netlify.app. Autopublishing is set to ON.

The staging site name is: mylo-unleather-staging.netlify.app

How would we go about getting the site to autoplublish to the primary staging site (mylo-unleather-staging.netlify.app) instead of a unique publishing url (60528c32ee96a50008989d89–mylo-unleather-staging.netlify.app) each time a new build is deployed?

hi there, could you pop a screenshot of your build settings please?