Box Specialist Safety Playing Style Dealbreaker

It seems as though the playing style dealbreaker for box specialist safeties is inverted. In a dynasty my safeties have 90 total tackles so far. My grade for this player type is an F. If I look at the team with the best grade on the list, Charlotte, they have 31 total tackles by their safeties with an A+ grade. As I go through the list it seems like there is a direct inverse relationship between the total number of tackles and the grade for that position. This is backwards. For most defensive stats the lower number is better, however this is one where a higher number is better. Should be a simple thing to address I think. I can provide more details or do some extra testing to prove this in another dynasty file if that helps.