Job Grade Filter not showing all positions?

As Internal Candidates are browsing available jobs under "Me" -> "Current Jobs", we're seeing an odd behavior. You can see that there are 385 available jobs to be browsed and/or applied for in this area. The majority of the filters on the left-hand side of the screen work exactly as expected. The Grade filter however, does not. As you can see, the number of available on this page does not match up AT ALL with the amount of current jobs the Job Grade filter recognizes. It apparently can only filter 59 out of the 385 by grade, which is just