CircleCI doesn't autorun on any branches

A new project was created on Monday for one of my team’s repositories. When the CircleCI project was started, it ran a build on our development branch, but hasn’t been able to run any builds since then. We’ve been pushing code to feature branches and merging PRs into development, but nothing is triggering new builds. The circle.yml is very simple and only describes the node version and an npm test command, plus a couple of deployment commands. Does anyone have any idea why the builds aren’t happening?