Portfolio Project Timeline and Task Links not Syncing

I have a portfolio that creates a project from a template whenever I create a SalesForce item. For whatever reason, it did not make a connection for a particular project. What would be the likely suspects for why a project would not update the Actual Timeline or Progress when project links are seemingly correct. It has since worked for similar newer projects so it seems to be a one-off, but I would still like to understand what happened to prevent it from happening again.