@kevinkt, I'm pasting the same response I've just sent you on Intercom so other users can take a look:
The reason behind that might be that a webhook from GitHub failed. Buddy gets the information about the changes in a form of webhooks sent by GitHub, Bitbucket or Gitlab. If Buddy does not receive a webhook for some reason (eg. networking problems, GitHub's breakdown, Buddy's update etc.) the changes will be uploaded with the next webhook we receive.