Grades on Positions not updating after grade on Job is updated

Summary:

We update the valid grade on a job and expect it to automatically update on all positions that inherit that job.

Content (required):

We update the valid grade on a job and expect it to automatically update on all positions that inherit that job. However, we're still seeing the old grade on the positions. What could cause this? Other job attributes updated (like name) are showing automatically updated on the Position. The job change record has an earlier effective date than the position start date so it's not an effective date issue, I don't believe.

Version (include the version you are using, if applicable):